Ultra-reliable low latency communication with multiple transmission-reception points

ABSTRACT

The techniques described herein provide procedures at user equipment (UEs) for performing channel state information (CSI) reporting and sounding reference signal (SRS) transmissions based on an ultra-reliable low latency communication (URLLC) block error rate (BLER) target and for reliably receiving PDCCH transmissions. For CSI reporting, a UE may be configured to generate a CSI report based on a BLER target and on received CSI reference signals (CSI-RSs), where the CSI-RSs may be transmitted on one or more groups of quasi co-located antenna ports. For SRS transmissions, a UE may be configured to transmit SRS based on an SRS configuration determined based on a BLER target. For receiving PDCCH transmissions, a UE may be configured to receive and combine DCI received from multiple base stations.

CROSS REFERENCES

The present Application for Patent claims the benefit of GreeceProvisional Patent Application No. 20180100203 by SARKIS, et al.,entitled “ULTRA-RELIABLE LO3 LATENCY COMMUNICATION WITH MULTIPLETRANSMISSION-RECEPTION POINTS,” filed May 11, 2018, assigned to theassignee hereof, and expressly incorporated by reference herein.

BACKGROUND

The following relates generally to wireless communications and morespecifically to ultra-reliable low latency communication (URLLC) withmultiple transmission-reception points (TRPs).

Wireless communications systems are widely deployed to provide varioustypes of communication content such as voice, video, packet data,messaging, broadcast, and so on. These systems may be capable ofsupporting communication with multiple users by sharing the availablesystem resources (e.g., time, frequency, and power). Examples of suchmultiple-access systems include fourth generation (4G) systems such asLong-Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, orLTE-A Pro systems, and fifth generation (5G) systems which may bereferred to as New Radio (NR) systems. These systems may employtechnologies such as code division multiple access (CDMA), time divisionmultiple access (TDMA), frequency division multiple access (FDMA),orthogonal frequency division multiple access (OFDMA), or discreteFourier transform-spread-OFDM (DFT-S-OFDM).

A wireless multiple-access communications system may include a number ofbase stations or network access nodes, each simultaneously supportingcommunication for multiple communication devices, which may be otherwiseknown as user equipment (UE). Some wireless communications systems maysupport URLLC between a base station and a UE. In some cases, differentURLLC applications or services may be associated with different blockerror rate (BLER) targets or reliability targets (e.g., 10⁻⁵ or 10⁻⁹).Conventional techniques for performing channel state information (CSI)reporting, sounding reference signal (SRS) transmissions, and physicaldownlink control channel (PDCCH) transmissions for URLLC may bedeficient considering the different BLER targets associated withdifferent URLLC applications or services.

SUMMARY

The described techniques relate to improved methods, systems, devices,or apparatuses that support ultra-reliable low latency communication(URLLC) with multiple transmission-reception points (TRPs).Specifically, the techniques described herein are related to performingchannel state information (CSI) reporting and sounding reference signal(SRS) transmissions based on a URLLC block error rate (BLER) target, andreliably receiving PDCCH transmissions. For CSI reporting, a UE may beconfigured to generate a CSI report based on a BLER target and onreceived CSI reference signals (CSI-RSs), where the CSI-RSs may betransmitted on one or more groups of quasi co-located antenna ports(e.g., by multiple TRPs). For SRS transmissions, a UE may be configuredto determine a configuration for an SRS transmission based on a BLERtarget configured for the SRS transmission, and the UE may transmit theSRS according to the determined configuration. For receiving PDCCHtransmissions, a UE may be configured to receive the same downlinkcontrol information (DCI) from multiple base stations in differentphysical downlink control channel (PDCCH) candidates, and the UE maycombine the DCI received from the multiple base stations.

A method for wireless communication at a UE is described. The method mayinclude receiving a plurality of CSI-RSs on corresponding CSI-RSresources associated with a CSI report, the plurality of CSI-RSs beingassociated with one or more sets of quasi co-located antenna ports;identifying, from a plurality of BLER targets, at least one BLER target;generating the CSI report based at least in part on the at least oneBLER target and the plurality of CSI-RSs; and transmitting the generatedCSI report.

An apparatus for wireless communication at a UE is described. Theapparatus may include means for receiving a plurality of CSI-RSs oncorresponding CSI-RS resources associated with a CSI report, theplurality of CSI-RSs being associated with one or more sets of quasico-located antenna ports; means for identifying, from a plurality ofBLER targets, at least one BLER target; means for generating the CSIreport based at least in part on the at least one BLER target and theplurality of CSI-RSs; and means for transmitting the generated CSIreport.

Another apparatus for wireless communication at a UE is described. Theapparatus may include a processor, memory in electronic communicationwith the processor, and instructions stored in the memory. Theinstructions may be operable to cause the processor to receive aplurality of CSI-RSs on corresponding CSI-RS resources associated with aCSI report, the plurality of CSI-RSs being associated with one or moresets of quasi co-located antenna ports; identify, from a plurality ofBLER targets, at least one BLER target; generate the CSI report based atleast in part on the at least one BLER target and the plurality ofCSI-RSs; and transmit the generated CSI report.

A non-transitory computer readable medium at a UE for wirelesscommunication is described. The non-transitory computer-readable mediummay include instructions operable to cause a processor to receive aplurality of CSI-RSs on corresponding CSI-RS resources associated with aCSI report, the plurality of CSI-RSs being associated with one or moresets of quasi co-located antenna ports; identify, from a plurality ofBLER targets, at least one BLER target; generate the CSI report based atleast in part on the at least one BLER target and the plurality ofCSI-RSs; and transmit the generated CSI report.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include:determining that a single set of quasi co-located antenna ports was usedto transmit the plurality of CSI-RSs on the corresponding CSI-RSresources; identifying that a same BLER target of the plurality of BLERtargets is associated with the plurality of CSI-RSs received on thecorresponding CSI-RS resources; and generating the CSI report based atleast in part on the same BLER target and the received CSI-RSs.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include:determining that a first set of quasi co-located antenna ports was usedto transmit a first set of the plurality of CSI-RSs and a second set ofquasi co-located antenna ports was used to transmit a second set of theplurality of CSI-RSs; identifying that a single BLER target isassociated with the plurality of CSI-RSs received on the correspondingCSI-RS resources; and generating the CSI report based at least in parton the single BLER target and the first and second sets of the pluralityof CSI-RSs.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, generating the CSI reportcomprises: including a channel quality indicator (CQI) in the CSI reportfor each of the first and second sets of the plurality of CSI-RSs basedat least in part on the single BLER target. In some examples of themethod, apparatus, and non-transitory computer-readable medium describedabove, generating the CSI report comprises: including a CQI in the CSIreport for either the first set of the plurality of CSI-RSs or thesecond set of the plurality of CSI-RSs based at least in part on thesingle BLER target. In some examples of the method, apparatus, andnon-transitory computer-readable medium described above, generating theCSI report comprises: including a CQI in the CSI report for each of thefirst and second sets of the plurality of CSI-RSs transmitted on asingle CSI-RS resource of the corresponding CSI-RS resources based atleast in part on the single BLER target.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above may further include:determining that a first set of quasi co-located antenna ports was usedto transmit a first set of the plurality of CSI-RSs and a second set ofquasi co-located antenna ports was used to transmit a second set of theplurality of CSI-RSs; identifying that multiple BLER targets of theplurality of BLER targets are associated with the plurality of CSI-RSs,each BLER target of the multiple BLER targets corresponding to a set ofquasi co-located antenna ports used to transmit a set of the pluralityof CSI-RSs; and generating the CSI report based at least in part on themultiple BLER targets and the first and second sets of the plurality ofCSI-RSs.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, generating the CSI reportcomprises: including a first CQI in the CSI report for the first set ofthe plurality of CSI-RSs based at least in part on a first BLER targetof the multiple BLER targets; and including a second CQI in the CSIreport for the second set of the plurality of CSI-RSs based at least inpart on a second BLER target of the multiple BLER targets.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, identifying the at least oneBLER target associated with the CSI-RSs comprises: receiving a CSIreport configuration indicating the at least one BLER target associatedwith the CSI-RSs. Some examples of the method, apparatus, andnon-transitory computer-readable medium described above may furtherinclude receiving a control message indicating a CQI table associatedwith each of the plurality of BLER targets.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the control message comprisesa medium access control (MAC) control element (MAC-CE), radio resourcecontrol (RRC) message, or a DCI message. In some examples of the method,apparatus, and non-transitory computer-readable medium described above,the UE is configured to transmit CSI reports, including the generatedCSI report, associated with a same BLER target. In some examples of themethod, apparatus, and non-transitory computer-readable medium describedabove, the UE is configured to transmit CSI reports, including thegenerated CSI report, associated with different BLER targets.

A method for wireless communication at a base station, comprising:identifying a plurality of CSI-RSs to transmit on corresponding CSI-RSresources; transmitting a control message indicating at least one BLERtarget, of a plurality of BLER targets; transmitting the plurality ofCSI-RSs on the corresponding CSI-RS resources on one or more sets ofquasi co-located antenna ports; and receiving a CSI report based atleast in part on the at least one BLER target and the plurality ofCSI-RSs.

An apparatus for wireless communication at a base station is described.The apparatus may include means for identifying a plurality of CSI-RSsto transmit on corresponding CSI-RS resources; means for transmitting acontrol message indicating at least one BLER target, of a plurality ofBLER targets; means for transmitting the plurality of CSI-RSs on thecorresponding CSI-RS resources on one or more sets of quasi co-locatedantenna ports; and means for receiving a CSI report based at least inpart on the at least one BLER target and the plurality of CSI-RSs.

Another apparatus for wireless communication at a base station isdescribed. The apparatus may include a processor, memory in electroniccommunication with the processor, and instructions stored in the memory.The instructions may be operable to cause the processor to identify aplurality of CSI-RSs to transmit on corresponding CSI-RS resources;transmit a control message indicating at least one BLER target, of aplurality of BLER targets; transmit the plurality of CSI-RSs on thecorresponding CSI-RS resources on one or more sets of quasi co-locatedantenna ports; and receive a CSI report based at least in part on the atleast one BLER target and the plurality of CSI-RSs.

A non-transitory computer readable medium at a base station for wirelesscommunication is described. The non-transitory computer-readable mediummay include instructions operable to cause a processor to identify aplurality of CSI-RSs to transmit on corresponding CSI-RS resources;transmit a control message indicating at least one BLER target, of aplurality of BLER targets; transmit the plurality of CSI-RSs on thecorresponding CSI-RS resources on one or more sets of quasi co-locatedantenna ports; and receive a CSI report based at least in part on the atleast one BLER target and the plurality of CSI-RSs.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above further include: identifying aCQI included in the CSI report associated with a BLER target of the atleast one BLER target; selecting a modulation and coding scheme (MCS)for transmitting data associated with the BLER target based at least inpart on the CQI; and transmitting the data using the selected MCS.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, selecting the MCS fortransmitting the data associated with the BLER target comprisesselecting the MCS for transmitting the data associated with the BLERtarget from an MCS table associated with the BLER target. In someexamples of the method, apparatus, and non-transitory computer-readablemedium described above, the MCS table associated with the BLER target isused to select MCSs for data transmissions using any set of antennaports. In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the MCS table associated withthe BLER target comprises a first MCS table used to select MCSs for datatransmissions using a first set of quasi co-located antenna ports, thefirst MCS table being different from a second MCS table used to selectMCSs for data transmissions using a second set of quasi co-locatedantenna ports.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the indication of the at leastone BLER target is included in a CSI report configuration. Some examplesof the method, apparatus, and non-transitory computer-readable mediumdescribed above further include transmitting another control messageindicating a CQI table associated with each of the plurality of BLERtargets. In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the other control messagecomprises a MAC-CE, RRC message, or a DCI message.

A method for wireless communication at a UE, comprising identifying,from a plurality of BLER targets, a BLER target for a transmission of aSRS; determining a configuration for transmitting the SRS based at leastin part on the BLER target; and transmitting the SRS according to thedetermined configuration.

An apparatus for wireless communication at a UE is described. Theapparatus may include means for identifying, from a plurality of BLERtargets, a BLER target for a transmission of a SRS; means fordetermining a configuration for transmitting the SRS based at least inpart on the BLER target; and means for transmitting the SRS according tothe determined configuration.

Another apparatus for wireless communication at a UE is described. Theapparatus may include a processor, memory in electronic communicationwith the processor, and instructions stored in the memory. Theinstructions may be operable to cause the processor to identify, from aplurality of BLER targets, a BLER target for a transmission of a SRS;determine a configuration for transmitting the SRS based at least inpart on the BLER target; and transmit the SRS according to thedetermined configuration.

A non-transitory computer readable medium at a UE for wirelesscommunication is described. The non-transitory computer-readable mediummay include instructions operable to cause a processor to identify, froma plurality of BLER targets, a BLER target for a transmission of a SRS;determine a configuration for transmitting the SRS based at least inpart on the BLER target; and transmit the SRS according to thedetermined configuration.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, determining the configurationfor transmitting the SRS based at least in part on the BLER targetcomprises determining a bandwidth for the SRS transmission based atleast in part on the BLER target. In some examples of the method,apparatus, and non-transitory computer-readable medium described above,determining the configuration for transmitting the SRS based at least inpart on the BLER target comprises determining a number of repetitions ina time or frequency domain for the SRS transmission based at least inpart on the BLER target. In some examples of the method, apparatus, andnon-transitory computer-readable medium described above, determining theconfiguration for transmitting the SRS based at least in part on theBLER target comprises determining a power for the SRS transmission basedat least in part on the BLER target.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, determining the configurationfor transmitting the SRS based at least in part on the BLER targetcomprises determining a number of symbols for the SRS transmission basedat least in part on the BLER target. In some examples of the method,apparatus, and non-transitory computer-readable medium described above,determining the configuration for transmitting the SRS based at least inpart on the BLER target comprises determining a comb level for the SRStransmission based at least in part on the BLER target. In some examplesof the method, apparatus, and non-transitory computer-readable mediumdescribed above, the comb level is further based at least in part on abandwidth to be used for the SRS transmission.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, identifying the BLER targetfor the transmission of the SRS comprises: receiving a CSI reportconfiguration associated with at least one CSI-RS resource, the CSIreport configuration indicating a BLER target for a CSI report; andidentifying the BLER target for the transmission of the SRS as the BLERtarget for the CSI report based on an SRS resource for the transmissionof the SRS being associated with the at least one CSI-RS resource.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above further include receiving acontrol message indicating parameters for the SRS transmission. In someexamples of the method, apparatus, and non-transitory computer-readablemedium described above, the control message comprises a MAC-CE, RRCmessage, or a DCI message.

A method for wireless communication at a base station, comprising:identifying, from a plurality of BLER targets, a BLER target for atransmission of a SRS from a UE; transmitting, to the UE, a controlmessage indicating the BLER target for the transmission of the SRS fromthe UE; and receiving the SRS in accordance with a configuration basedat least in part on the BLER target.

An apparatus for wireless communication at a base station is described.The apparatus may include means for identifying, from a plurality ofBLER targets, a BLER target for a transmission of a SRS from a UE; meansfor transmitting, to the UE, a control message indicating the BLERtarget for the transmission of the SRS from the UE; and means forreceiving the SRS in accordance with a configuration based at least inpart on the BLER target.

Another apparatus for wireless communication at a base station isdescribed. The apparatus may include a processor, memory in electroniccommunication with the processor, and instructions stored in the memory.The instructions may be operable to cause the processor to identify,from a plurality of BLER targets, a BLER target for a transmission of aSRS from a UE; transmit, to the UE, a control message indicating theBLER target for the transmission of the SRS from the UE; and receive theSRS in accordance with a configuration based at least in part on theBLER target.

A non-transitory computer readable medium at a base station for wirelesscommunication is described. The non-transitory computer-readable mediummay include instructions operable to cause a processor to identify, froma plurality of BLER targets, a BLER target for a transmission of a SRSfrom a UE; transmit, to the UE, a control message indicating the BLERtarget for the transmission of the SRS from the UE; and receive the SRSin accordance with a configuration based at least in part on the BLERtarget.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the configuration comprises abandwidth used for the SRS transmission. In some examples of the method,apparatus, and non-transitory computer-readable medium described above,the configuration comprises a number of repetitions in a time orfrequency domain used for the SRS transmission. In some examples of themethod, apparatus, and non-transitory computer-readable medium describedabove, the configuration comprises a power used for the SRStransmission.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the configuration comprises anumber of symbols used for the SRS transmission. In some examples of themethod, apparatus, and non-transitory computer-readable medium describedabove, the configuration comprises a comb level used for the SRStransmission. In some examples of the method, apparatus, andnon-transitory computer-readable medium described above, the comb levelis based at least in part on a bandwidth used for the SRS transmission.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the indication of the BLERtarget is included in a channel state information (CSI) reportconfiguration.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described above further include transmittinganother control message indicating SRS parameters for the SRStransmission. In some examples of the method, apparatus, andnon-transitory computer-readable medium described above, the othercontrol message comprises a MAC-CE, RRC message, or a DCI message.

A method for wireless communication at a UE, comprising: monitoring aplurality of PDCCH candidates for DCI from a plurality of base stations;receiving the DCI in the PDCCH candidates from the plurality of basestations, wherein each PDCCH candidate that includes the DCI from onebase station maps to a PDCCH candidate that includes the DCI fromanother base station; combining the DCI received from the plurality ofbase stations in the plurality of PDCCH candidates; and receiving datafrom or transmitting data to at least one of the plurality of basestations based at least in part on the combined DCI.

An apparatus for wireless communication at a UE is described. Theapparatus may include means for monitoring a plurality of PDCCHcandidates for DCI from a plurality of base stations; means forreceiving the DCI in the PDCCH candidates from the plurality of basestations, wherein each PDCCH candidate that includes the DCI from onebase station maps to a PDCCH candidate that includes the DCI fromanother base station; means for combining the DCI received from theplurality of base stations in the plurality of PDCCH candidates; andmeans for receiving data from or transmitting data to at least one ofthe plurality of base stations based at least in part on the combinedDCI.

Another apparatus for wireless communication at a UE is described. Theapparatus may include a processor, memory in electronic communicationwith the processor, and instructions stored in the memory. Theinstructions may be operable to cause the processor to monitor aplurality of PDCCH candidates for DCI from a plurality of base stations;receive the DCI in the PDCCH candidates from the plurality of basestations, wherein each PDCCH candidate that includes the DCI from onebase station maps to a PDCCH candidate that includes the DCI fromanother base station; combine the DCI received from the plurality ofbase stations in the plurality of PDCCH candidates; and receive datafrom or transmitting data to at least one of the plurality of basestations based at least in part on the combined DCI.

A non-transitory computer readable medium at a UE for wirelesscommunication is described. The non-transitory computer-readable mediummay include instructions operable to cause a processor to monitor aplurality of PDCCH candidates for DCI from a plurality of base stations;receive the DCI in the PDCCH candidates from the plurality of basestations, wherein each PDCCH candidate that includes the DCI from onebase station maps to a PDCCH candidate that includes the DCI fromanother base station; combine the DCI received from the plurality ofbase stations in the plurality of PDCCH candidates; and receive datafrom or transmitting data to at least one of the plurality of basestations based at least in part on the combined DCI.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, the data is rate-matchedaround the PDCCH candidates including DCI from the plurality of basestations and the PDCCH candidates without DCI from the plurality of basestations. In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, an index of each PDCCHcandidate that includes the DCI is the same. In some examples of themethod, apparatus, and non-transitory computer-readable medium describedabove, an aggregation level of each PDCCH candidate that includes theDCI is the same.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described above, a first PDCCH candidateincluding the DCI from a first base station spans a same set of resourceelements as a second PDCCH candidate including the DCI from a secondbase station. In some examples of the method, apparatus, andnon-transitory computer-readable medium described above, a first PDCCHcandidate including the DCI from a first base station spans a differentset of resource elements from a second PDCCH candidate including the DCIfrom a second base station. In some examples of the method, apparatus,and non-transitory computer-readable medium described above, a firstPDCCH including the DCI from a first base station includes demodulationreference signals (DMRSs) on a same port as DMRSs included in a secondPDCCH including the DCI from a second base station. In some examples ofthe method, apparatus, and non-transitory computer-readable mediumdescribed above, a first PDCCH including the DCI from a first basestation includes demodulation reference signals (DMRSs) on a differentport from DMRSs included in a second PDCCH including the DCI from asecond base station.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1-4 illustrate examples of wireless communications systems thatsupport ultra-reliable low latency communication (URLLC) with multipletransmission-reception points (TRPs) in accordance with aspects of thepresent disclosure.

FIGS. 5 and 6 show block diagrams of devices that support URLLC withmultiple TRPs in accordance with aspects of the present disclosure.

FIG. 7 shows a block diagram of a communications manager that supportsURLLC with multiple TRPs in accordance with aspects of the presentdisclosure.

FIG. 8 shows a diagram of a system including a device that supportsURLLC with multiple TRPs in accordance with aspects of the presentdisclosure.

FIGS. 9 and 10 show block diagrams of devices that support URLLC withmultiple TRPs in accordance with aspects of the present disclosure.

FIG. 11 shows a block diagram of a communications manager that supportsURLLC with multiple TRPs in accordance with aspects of the presentdisclosure.

FIG. 12 shows a diagram of a system including a device that supportsURLLC with multiple TRPs in accordance with aspects of the presentdisclosure.

FIGS. 13-17 show flowcharts illustrating methods that support URLLC withmultiple TRPs in accordance with aspects of the present disclosure.

DETAILED DESCRIPTION

In some wireless communications systems, a user equipment (UE) may beconfigured to transmit channel state information (CSI) reports to a basestation. CSI reports may include information for a base station to useto determine appropriate configurations for communicating with a UE. Forinstance, a CSI report from a UE may include a channel quality indicator(CQI) which a base station may use to identify a modulation and codingscheme (MCS) for a transmission to the UE. In addition to CSI reporting,a UE may be configured to transmit sounding reference signals (SRSs) toa base station which the base station may use to estimate the quality ofchannels available for communicating with the UE. The base station maythen use the channel estimates to determine which resources to use tocommunicate with the UE. Thus, a base station 105 may use CSI reportsand SRSs received from a UE to determine appropriate configurations andappropriate resources for communicating with the UE.

In some cases, different applications or services (e.g., communicationswith different transmission-reception points (TRPs)) may be associatedwith different block error rate (BLER) targets or reliability targets(e.g., 10⁻⁵ or 10⁻⁹). In such cases, if the information included in aCSI report is determined independent of a BLER target, and a basestation determines a configuration for communicating with a UE using theinformation included in the CSI report, the base station may not be ableto satisfy the BLER target for a particular application or service.Similarly, if a UE identifies a configuration for an SRS transmission toa base station independent of a BLER target configured for the SRStransmission, the UE may not be able to satisfy the BLER target for theSRS transmission. Further, if a UE is unable to receive controlinformation from a base station (e.g., if a control informationtransmission from the base station is unreliable), the UE may not beable to identify resources allocated for communicating with the basestation, resulting in reduced throughput in a wireless communicationssystem.

As described herein, a wireless communications system may supportefficient techniques for performing CSI reporting and SRS transmissionsbased on a configured BLER target, and for reliably receiving PDCCHtransmissions. For CSI reporting, a UE may be configured to generate aCSI report based on a BLER target and on received CSI reference signals(CSI-RSs), where the CSI-RSs may be transmitted on one or more groups ofquasi co-located antenna ports. For SRS transmissions, a UE may beconfigured to determine a configuration for an SRS transmission based ona BLER target configured for the SRS transmission, and the UE maytransmit the SRS according to the determined configuration. Forreceiving physical downlink control channel (PDCCH) transmissions, a UEmay be configured to receive downlink control information (DCI) frommultiple base stations in PDCCH candidates from the multiple basestations, and the UE may combine the DCI received from the multiple basestations.

Aspects of the disclosure introduced above are described below in thecontext of a wireless communications system. Examples of processes andsignaling exchanges that support ultra-reliable low latencycommunication (URLLC) with multiple TRPs are then described. Aspects ofthe disclosure are further illustrated by and described with referenceto apparatus diagrams, system diagrams, and flowcharts that relate toURLLC with multiple TRPs.

FIG. 1 illustrates an example of a wireless communications system 100that supports URLLC with multiple TRPs in accordance with aspects of thepresent disclosure. The wireless communications system 100 includes basestations 105, UEs 115, and a core network 130. In some examples, thewireless communications system 100 may be a Long-Term Evolution (LTE)network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, or a NewRadio (NR) network. In some cases, wireless communications system 100may support enhanced broadband communications, ultra-reliable (e.g.,mission critical) communications, low latency communications, URLLC, orcommunications with low-cost and low-complexity devices.

Base stations 105 may wirelessly communicate with UEs 115 via one ormore base station antennas. Base stations 105 described herein mayinclude or may be referred to by those skilled in the art as a basetransceiver station, a radio base station, an access point, a radiotransceiver, a NodeB, an eNodeB (eNB), a next-generation Node B orgiga-nodeB (either of which may be referred to as a gNB), a Home NodeB,a Home eNodeB, or some other suitable terminology. Wirelesscommunications system 100 may include base stations 105 of differenttypes (e.g., macro or small cell base stations). The UEs 115 describedherein may be able to communicate with various types of base stations105 and network equipment including macro eNBs, small cell eNBs, gNBs,relay base stations, and the like.

Each base station 105 may be associated with a particular geographiccoverage area 110 in which communications with various UEs 115 issupported. Each base station 105 may provide communication coverage fora respective geographic coverage area 110 via communication links 125,and communication links 125 between a base station 105 and a UE 115 mayutilize one or more carriers. Communication links 125 shown in wirelesscommunications system 100 may include uplink transmissions from a UE 115to a base station 105, or downlink transmissions from a base station 105to a UE 115. Downlink transmissions may also be called forward linktransmissions while uplink transmissions may also be called reverse linktransmissions.

The geographic coverage area 110 for a base station 105 may be dividedinto sectors making up only a portion of the geographic coverage area110, and each sector may be associated with a cell. For example, eachbase station 105 may provide communication coverage for a macro cell, asmall cell, a hot spot, or other types of cells, or various combinationsthereof. In some examples, a base station 105 may be movable andtherefore provide communication coverage for a moving geographiccoverage area 110. In some examples, different geographic coverage areas110 associated with different technologies may overlap, and overlappinggeographic coverage areas 110 associated with different technologies maybe supported by the same base station 105 or by different base stations105. The wireless communications system 100 may include, for example, aheterogeneous LTE/LTE-A/LTE-A Pro or NR network in which different typesof base stations 105 provide coverage for various geographic coverageareas 110.

The term “cell” may refer to a logical communication entity used forcommunication with a base station 105 (e.g., over a carrier), and may beassociated with an identifier for distinguishing neighboring cells(e.g., a physical cell identifier (PCID), a virtual cell identifier(VCID)) operating via the same or a different carrier. In some examples,a carrier may support multiple cells, and different cells may beconfigured according to different protocol types (e.g., machine-typecommunication (MTC), narrowband Internet-of-Things (NB-IoT), enhancedmobile broadband (eMBB), or others) that may provide access fordifferent types of devices. In some cases, the term “cell” may refer toa portion of a geographic coverage area 110 (e.g., a sector) over whichthe logical entity operates.

UEs 115 may be dispersed throughout the wireless communications system100, and each UE 115 may be stationary or mobile. A UE 115 may also bereferred to as a mobile device, a wireless device, a remote device, ahandheld device, or a subscriber device, or some other suitableterminology, where the “device” may also be referred to as a unit, astation, a terminal, or a client. A UE 115 may also be a personalelectronic device such as a cellular phone, a personal digital assistant(PDA), a tablet computer, a laptop computer, or a personal computer. Insome examples, a UE 115 may also refer to a wireless local loop (WLL)station, an Internet of Things (IoT) device, an Internet of Everything(IoE) device, or an MTC device, or the like, which may be implemented invarious articles such as appliances, vehicles, meters, or the like.

Base stations 105 may communicate with the core network 130 and with oneanother. For example, base stations 105 may interface with the corenetwork 130 through backhaul links 132 (e.g., via an S1 or otherinterface). Base stations 105 may communicate with one another overbackhaul links 134 (e.g., via an X2 or other interface) either directly(e.g., directly between base stations 105) or indirectly (e.g., via corenetwork 130).

The core network 130 may provide user authentication, accessauthorization, tracking, Internet Protocol (IP) connectivity, and otheraccess, routing, or mobility functions. The core network 130 may be anevolved packet core (EPC), which may include at least one mobilitymanagement entity (MME), at least one serving gateway (S-GW), and atleast one Packet Data Network (PDN) gateway (P-GW). The MME may managenon-access stratum (e.g., control plane) functions such as mobility,authentication, and bearer management for UEs 115 served by basestations 105 associated with the EPC. User IP packets may be transferredthrough the S-GW, which itself may be connected to the P-GW. The P-GWmay provide IP address allocation as well as other functions. The P-GWmay be connected to the network operators IP services. The operators IPservices may include access to the Internet, Intranet(s), an IPMultimedia Subsystem (IMS), or a Packet-Switched (PS) Streaming Service.

At least some of the network devices, such as a base station 105, mayinclude subcomponents such as an access network entity, which may be anexample of an access node controller (ANC). Each access network entitymay communicate with UEs 115 through a number of other access networktransmission entities, which may be referred to as a radio head, a smartradio head, or a TRP. In some configurations, various functions of eachaccess network entity or base station 105 may be distributed acrossvarious network devices (e.g., radio heads and access networkcontrollers) or consolidated into a single network device (e.g., a basestation 105).

In some cases, wireless communications system 100 may be a packet-basednetwork that operates according to a layered protocol stack. In the userplane, communications at the bearer or Packet Data Convergence Protocol(PDCP) layer may be IP-based. A Radio Link Control (RLC) layer may insome cases perform packet segmentation and reassembly to communicateover logical channels. A Medium Access Control (MAC) layer may performpriority handling and multiplexing of logical channels into transportchannels. The MAC layer may also use hybrid automatic repeat request(HARD) to provide retransmission at the MAC layer to improve linkefficiency. In the control plane, the Radio Resource Control (RRC)protocol layer may provide establishment, configuration, and maintenanceof an RRC connection between a UE 115 and a base station 105 or corenetwork 130 supporting radio bearers for user plane data. At thePhysical (PHY) layer, transport channels may be mapped to physicalchannels.

Time intervals in LTE or NR may be expressed in multiples of a basictime unit, which may, for example, refer to a sampling period ofT_(s)=1/30,720,000 seconds. Time intervals of a communications resourcemay be organized according to radio frames each having a duration of 10milliseconds (ms), where the frame period may be expressed asT_(f)=307,200 T_(s). The radio frames may be identified by a systemframe number (SFN) ranging from 0 to 1023. Each frame may include 10subframes numbered from 0 to 9, and each subframe may have a duration of1 ms. A subframe may be further divided into 2 slots each having aduration of 0.5 ms, and each slot may contain 6 or 7 modulation symbolperiods (e.g., depending on the length of the cyclic prefix prepended toeach symbol period). Excluding the cyclic prefix, each symbol period maycontain 2048 sampling periods. In some cases, a subframe may be thesmallest scheduling unit of the wireless communications system 100 andmay be referred to as a transmission time interval (TTI). In othercases, a smallest scheduling unit of the wireless communications system100 may be shorter than a subframe or may be dynamically selected (e.g.,in bursts of shortened TTIs (sTTIs) or in selected component carriersusing sTTIs).

Physical channels may be multiplexed on a carrier according to varioustechniques. A physical control channel and a physical data channel maybe multiplexed on a downlink carrier, for example, using time divisionmultiplexing (TDM) techniques, frequency division multiplexing (FDM)techniques, or hybrid TDM-FDM techniques. In some examples, controlinformation transmitted in a physical control channel may be distributedbetween different control regions in a cascaded manner (e.g., between acommon control region or common search space and one or more UE-specificcontrol regions or UE-specific search spaces). As described herein, abase station 105 may transmit control information to a UE 115 indownlink control information (DCI), MAC control elements (MAC-CEs), orRRC messages. In some cases, the dynamic signaling of parametersdescribed herein using DCI may significantly increase DCI size and maydegrade the performance of DCI. Further, the use of RRC messages forsignaling the parameters described herein may result in high latency.Thus, at least some of the parameters described herein may be signaledusing MAC-CEs.

In some cases, a UE 115 may transmit uplink signals (e.g., SRSs) onresources interleaved with other resources used for other transmissions(e.g., SRS transmissions from different UEs), resulting in a comb-likeeffect. In such cases, the UE 115 may be configured to transmit anuplink transmission using different comb levels, where a comb level maycorrespond to the number of other transmissions with which the uplinktransmission is interleaved (e.g., the gap between resources used forthe interleaved uplink transmission). For instance, a high comb level(e.g., comb-6) may be associated with a large number of othertransmissions interleaved with the uplink transmission (e.g., a largegap between resources used for the interleaved uplink transmission), anda low comb-level (e.g., comb-1 and comb-2) may be associated with asmall number of other transmissions interleaved with the uplinktransmission (e.g., a small gap between resources used for theinterleaved uplink transmission).

In some examples, base station 105 or UE 115 may be equipped withmultiple antennas, which may be used to employ techniques such astransmit diversity, receive diversity, multiple-input multiple-output(MIMO) communications, or beamforming. For example, wirelesscommunications system 100 may use a transmission scheme between atransmitting device (e.g., a base station 105) and a receiving device(e.g., a UE 115), where the transmitting device is equipped withmultiple antennas and the receiving devices are equipped with one ormore antennas. MIMO communications may employ multipath signalpropagation to increase the spectral efficiency by transmitting orreceiving multiple signals via different spatial layers, which may bereferred to as spatial multiplexing. The multiple signals may, forexample, be transmitted by the transmitting device via differentantennas or different combinations of antennas. Likewise, the multiplesignals may be received by the receiving device via different antennasor different combinations of antennas. Each of the multiple signals maybe referred to as a separate spatial stream and may carry bitsassociated with the same data stream (e.g., the same codeword) ordifferent data streams.

Different spatial layers may be associated with different antenna portsused for channel measurement and reporting. An antenna port is a logicalentity used to map data streams to antennas. A given antenna port maydrive transmissions from one or more antennas (e.g., and resolve signalcomponents received over one or more antennas). Each antenna port may beassociated with a reference signal (e.g., which may allow the receiverto distinguish data streams associated with the different antenna portsin a received transmission). In some cases, some antenna ports may bereferred to as quasi co-located, meaning that the spatial parametersassociated with a transmission on one antenna port may be inferred fromthe spatial parameters associated with another transmission on adifferent antenna port. That is, the antenna ports may have a quasico-location (QCL) relationship with each other. Transmissions from agroup of quasi co-located antenna ports may be referred to astransmissions from a QCL group.

A UE 115 in wireless communications system 100 may be configured totransmit CSI reports to a base station 105. CSI reports may includeinformation for a base station 105 to use to determine appropriateconfigurations for communicating with a UE 115. For instance, a CSIreport from a UE 115 may include a CQI which a base station 105 may useto identify an MCS for a transmission to a UE 115. In addition to CSIreporting, a UE 115 may be configured to transmit SRSs to a base station105. The base station 105 may transmit an indication of an SRS resourcefor the UE 115 to use for an SRS transmission, and the UE 115 maytransmit the SRS on the SRS resource (e.g., using a same port used bythe base station 105 to signal the SRS resource). The base station 105may then use the SRSs to estimate the quality of channels available forcommunicating with the UE 115 such that the base station may be able toidentify appropriate resources for communicating with the UE 115. Thus,a base station 105 may use CSI reports and SRSs received from a UE 115to determine appropriate configurations and appropriate resources forcommunicating with the UE 115.

As mentioned above, wireless communications system 100 may support URLLCbetween base stations 105 and UEs 115. In some cases, different URLLCapplications or services may be associated with different BLER targetsor reliability targets (e.g., 10⁻⁵ or 10⁻⁹). In such cases, if theinformation included in a CSI report is determined independent of a BLERtarget, and a base station 105 determines a configuration forcommunicating with a UE 115 using the information included in the CSIreport, the base station 105 may not be able to satisfy the BLER targetfor a particular application or service. Similarly, if a UE 115identifies a configuration for an SRS transmission to a base station 105independent of a BLER target configured for the SRS transmission, the UE115 may not be able to satisfy the BLER target for the SRS transmission.Further, if a UE 115 is unable to receive control information from abase station 105 (e.g., if a control information transmission from thebase station 105 is unreliable), the UE 115 may not be able to identifyresources for communicating with the base station 105, resulting inreduced throughput in a wireless communications system. Wirelesscommunications system 100 may support efficient techniques forperforming CSI reporting and SRS transmissions based on a configuredBLER target, and for reliably receiving PDCCH transmissions.

FIG. 2 illustrates an example of a wireless communications system 200that supports URLLC with multiple TRPs in accordance with aspects of thepresent disclosure. Wireless communications system 200 includes basestation 105-a and UE 115-a, which may be examples of the correspondingdevices described with reference to FIG. 1. Base station 105-a maycommunicate with UEs 115 (including UE 115-a) within coverage area110-a. For example, base station 105-a may communicate with UE 115-a onresources of carriers 205. In particular, base station 105-a maytransmit downlink signals to UE 115-a on resources of a carrier 205-a,and UE 115-a may transmit uplink signals to base station 105-a onresources of a carrier 205-b. In some cases, carrier 205-a and carrier205-b may be different, and, in other cases, carrier 205-a and carrier205-b may be the same. Although FIG. 2 illustrates an example of a UE115-a performing CSI reporting based on CSI-RSs received on CSI-RSresources from base station 105-a, it is to be understood that theCSI-RSs used to perform CSI reporting in accordance with the techniquesdescribed herein may be transmitted by multiple TRPs (e.g., TRPsconnected to base station 105-a or TRPs connected to multiple basestations 105).

Wireless communications system 200 may implement aspects of wirelesscommunications system 100. For example, wireless communications system200 may support efficient techniques for performing CSI reporting basedon a configured BLER target. In the example of FIG. 2, base station105-a may transmit a CSI report configuration to UE 115, which mayindicate a configuration for a CSI report 210 to be transmitted by UE115-a to base station 105-a. For instance, the CSI report configurationmay indicate one or more BLER targets associated with the CSI report 210and may indicate a CSI-RS resource set 215 that includes CSI-RSs for theUE 115-a to use to perform measurements to generate the CSI report(e.g., where the CSI-RSs may be transmitted by multiple TRPSs). In someaspects, the CSI report configuration may indicate a mapping betweeneach of the one or more BLER targets and corresponding CSI-RS resources,and UE 115-a may generate CSI feedback (e.g., to be included in CSIreport 210) using CSI-RSs received on CSI-RS resources based on a BLERtarget mapped to the CSI-RS resources in the CSI report configuration.

In some cases, UE 115-a may be configured to transmit CSI reports basedon the same BLER target (e.g., UE 115-a may be configured with CSIprocesses having the same BLER target) or based on different BLERtargets (e.g., UE 115-a may be configured with CSI processes havingdifferent BLER targets). The configuration of whether to transmit CSIreports based on the same BLER target or different BLER targets may befixed (e.g., not configurable) or variable (e.g., configurable via aMAC-CE, DCI message, or an RRC message from base station 105-a).

In such cases, UE 115-a may receive CSI-RSs on CSI-RS resources 220 ofthe CSI-RS resource set 215, and UE 115-a may perform measurements onthe CSI-RSs to determine the CSI feedback (e.g., CQI) to include in CSIreport 210. The CSI feedback included in CSI report 210 (e.g., CQI) maydepend on the BLER target associated with CSI report 210. For instance,UE 115-a may receive an indication of different CQI tables associatedwith different BLER targets from base station 105 (e.g., in a MAC-CE,DCI, or an RRC message), and UE 115-a may determine a CQI to include inCSI report 210 from an appropriate CQI table based on a BLER targetassociated with CSI report 210. In addition, the CSI feedback includedin CSI report 210 (e.g., CQI) may further be based on whether theantenna ports used to transmit the CSI-RSs received on CSI-RS resources220 of the CSI-RS resource set 215 are in a same QCL group 225 or indifferent QCL groups 225 (e.g., in a coherent or non-coherentcoordinated multipoint (CoMP) transmission).

In one example, if antenna ports in different QCL groups 225 are used totransmit CSI-RSs on CSI-RS resources 220 (as illustrated), and a singleBLER target is configured for CSI report 210, UE 115-a may be configuredto include CQI values in CSI report 210 for each QCL group 225 or for asubset of the QCL groups 225 based on the single BLER target. In oneaspect of this example, UE 115-a may include, in CSI report 210, a CQIvalue for each QCL group 225 across all CSI-RS resources 220 of CSI-RSresource set 215 based on the single BLER target. In another aspect ofthis example, UE 115-a may include, in CSI report 210, a single CQIvalue for one QCL group 225 across all CSI-RS resources 220 of CSI-RSresource set 215.

In yet another aspect of this example, UE 115-a may be configured toinclude, in CSI report 210, a CQI value for each QCL group 225 on oneCSI-RS resource 220 (e.g., CSI-RS resource 220-a) of the CSI-RS resourceset 215 (e.g., each QCL group used to transmit CSI-RSs on the CSI-RSresource). The configuration of whether to include a CQI value for eachQCL group 225 across all CSI-RS resources 220 of CSI-RS resource set215, for one QCL group 225 across all CSI-RS resources 220 of CSI-RSresource set 215, or for each QCL group 225 on one CSI-RS resource 220may be fixed (e.g., not configurable) or variable (e.g., configurablevia a MAC-CE, DCI message, or an RRC message from base station 105-a).Further, the configuration may depend on a capability of UE 115-a.

In another example, if antenna ports in different QCL groups 225 areused to transmit CSI-RSs on CSI-RS resources 220 (as illustrated), andmultiple BLER targets are configured for CSI report 210, UE 115-a may beconfigured to include CQI values in CSI report 210 for each QCL group225. In this example, the number of BLER targets configured for CSIreport 210 may be the same as the number of QCL groups 225 used totransmit CSI-RSs on CSI-RS resources 220 of CSI-RS resource set 215.Thus, each BLER target may be mapped to a QCL group (e.g., the BLERtarget values indicated in a CSI report configuration may besequentially mapped to the QCL groups used to transmit the CSI-RSs), andUE 115-a may include, in CSI report 210, a CQI value for each QCL group225 based on a corresponding BLER target. In yet another example, ifantenna ports in the same QCL group are used to transmit CSI-RSs onCSI-RS resources 220 (not illustrated), a single BLER target may beconfigured for CSI report 210, and UE 115-a may be configured to includea single CQI value in CSI report 210 for all the CSI-RSs received.

Once base station 105-a receives the CSI report 210 from UE 115-a, basestation 105-a may use the information in CSI report 210 to identify anappropriate configuration for communicating with UE 115-a. For example,base station 105-a may identify the CQI values included in the CSIreport 210, and base station 105-a may use the CQI values to determinean appropriate modulation and coding scheme (MCS) for a transmission toUE 115-a. Specifically, the CQI values in CSI report 210 may correspondto a specific MCS in an MCS table, and base station 105-a may determinethe MCS using the MCS table based on the CQI values. In some cases, theMCS tables may be different for different BLER targets, such that basestation 105-a may be able to determine an appropriate MCS for atransmission based on the BLER target for that transmission.

In such cases, UE 115-a may receive an indication of different MCStables associated with different BLER targets from base station 105(e.g., in a MAC-CE, DCI, or an RRC message), and UE 115-a may determinean MCS to use for a transmission from an appropriate MCS table based ona BLER target associated with the transmission. Further, the MCS tablesmay be different for different QCL groups, such that a base station105-a may be able to determine an appropriate MCS for a transmissionbased on an antenna port to be used for the transmission (i.e., basestation 105-a may use the MCS table that corresponds to the QCL group ofthe antenna port to be used for a transmission). Alternatively, the MCStables may be the same for different QCL groups.

FIG. 3 illustrates an example of a wireless communications system 300that supports URLLC with multiple TRPs in accordance with aspects of thepresent disclosure. Wireless communications system 300 includes basestation 105-b and UE 115-b, which may be examples of the correspondingdevices described with reference to FIGS. 1 and 2. Base station 105-bmay communicate with UEs 115 (including UE 115-b) within coverage area110-b. For example, base station 105-b may communicate with UE 115-b onresources of carriers 305. In particular, base station 105-b maytransmit downlink signals to UE 115-b on resources of a carrier 305-a,and UE 115-b may transmit uplink signals to base station 105-b onresources of a carrier 305-b. In some cases, carrier 305-a and carrier305-b may be different, and, in other cases, carrier 305-a and carrier305-b may be the same.

Wireless communications system 300 may implement aspects of wirelesscommunications system 100. For example, wireless communications system300 may support efficient techniques for performing SRS transmissionsbased on a configured BLER target. In the example of FIG. 3, UE 115-bmay be configured to transmit SRSs 315 to base station 105-b. Thus, asdescribed herein, prior to transmitting the SRSs 315, UE 115-b mayidentify a BLER target associated with the SRS transmission 315 suchthat UE 115-b may be able to identify an appropriate configuration forthe SRS transmission 315. In some cases, the BLER target for the SRStransmission 315 may be determined based on a BLER target configured fora CSI report.

In particular, base station 105-b may transmit a CSI reportconfiguration 310 to UE 115-b, which may indicate a configuration for aCSI report to be transmitted by UE 115-b to base station 105-b,including a BLER target associated with the CSI report. Since an SRSresource configured for the SRS transmission 315 may be associated witha CSI-RS resource used to transmit CSI-RSs for a CSI report, UE 115-bmay determine the BLER target for the SRS transmission based on the BLERtarget configured for the associated CSI report. That is, UE 115-b maydetermine the CSI-RS resource associated with an SRS resource for an SRStransmission, and UE 115-b may determine the BLER target for the SRStransmission to be the same as the BLER target configured for a CSIreport generated using CSI-RSs received on the associated CSI-RSresource.

Once UE 115-b identifies the BLER target for the SRS transmission 315,UE 115-b may determine an appropriate configuration for the SRStransmission 315 using the techniques described herein. Specifically, UE115-b may determine a bandwidth, a number of repetitions (e.g., in atime or frequency domain), a power, a number of SRS symbols, and a comblevel for SRS transmission 315 based on the BLER target for the SRStransmission 315. That is, UE 115-b may determine an SRS density basedon the BLER target for the SRS transmission 315. The values of theparameters described above (i.e., bandwidth, number of repetitions,power, number of SRS symbols, comb level, etc.) may be signaled to UE115-b from base station 105-b for different BLER targets (e.g., in aMAC-CE, DCI, or an RRC message).

For a low BLER target (e.g., a BLER target below a threshold), UE 115-bmay use a wider bandwidth, larger number of repetitions, higher power,larger number of SRS symbols (e.g., an SRS symbol for each QCL groupavailable), lower comb level (e.g., comb-1 or comb-2), or a combinationthereof for SRS transmission 315. For a high BLER target (e.g., a BLERtarget above a threshold), UE 115-b may use a narrower bandwidth,smaller number of repetitions, lower power, smaller number of SRSsymbols, higher comb level (e.g., comb-4), or a combination thereof forSRS transmission 315. In some cases, UE 115-b may select a comb levelfor SRS transmission 315 based on a BLER target. In such cases, UE 115-bmay be restricted to using low comb levels if SRS transmission 315 has alow BLER target, and UE 115-b may be able to use a wide range of comblevels if SRS transmission 315 has a high BLER target. In other cases,UE 115-b may be able to use a wide range of comb levels for SRStransmission 315, but UE 115-b may be configured to use high comb levelsonly when other techniques for improving the reliability of SRStransmission 315 are implemented (e.g., increased density).

Thus, the comb level used for SRS transmission 315 may be based on thebandwidth used for SRS transmission 315. Specifically, when a widebandwidth is used for SRS transmission 315, UE 115-b may use a high comblevel for SRS transmission 315 (e.g., without significantly degradingthe quality of the SRS transmission 315), and when a narrow bandwidth isused for SRS transmission 315, UE 115-b may use a low comb level for SRStransmission 315. The use of a higher comb level may reduce the overheadof SRS transmission 315 such that more resources may be available forother channels (e.g., PUSCH), resulting in improved data transmissionreliability since UE 115-b may be able to use a lower coding rate for adata transmission when more resources are available for a datatransmission. Accordingly, in some aspects of the techniques describedherein, UE 115-b may be configured to use a new comb level (e.g.,comb-6) in conjunction with a wider bandwidth for SRS transmission 315.

FIG. 4 illustrates an example of a wireless communications system 400that supports URLLC with multiple TRPs in accordance with aspects of thepresent disclosure. Wireless communications system 400 includes basestation 105-c, base station 105-d, and UE 115-c, which may be examplesof the corresponding devices described with reference to FIGS. 1, 2, and3. Base station 105-c may transmit downlink signals to UE 115-c onresources of a carrier 405-a, and base station 105-d may transmitdownlink signals to UE 115-c on resources of a carrier 405-b. Wirelesscommunications system 400 may implement aspects of wirelesscommunications system 100. For example, wireless communications system400 may support efficient techniques for performing PDCCH transmissionsto improve the reliability of the PDCCH transmissions.

Specifically, in the example of FIG. 4, base station 105-c and basestation 105-d (i.e., multiple base stations 105 or TRPs) may transmitthe same DCI 410 to UE 115-c to improve the chances that DCI 410 isreceived by UE 115-c. Thus, using the techniques described herein, datatransmissions and control transmissions may have multi-TRP diversity.The DCI 410 transmitted by base station 105-c and base station 105-d mayinclude the same information. For instance, DCI 410 transmitted by basestation 105-c and base station 105-d may include the same uplink grantfor an uplink transmission to base station 105-c, base station 105-d, orboth, or DCI 410 transmitted by base station 105-c and base station105-d may include the same downlink grant for a downlink transmissionfrom base station 105-c, base station 105-d, or both. Once UE 115-creceives DCI 410 from base station 105-c and base station 105-d, UE115-c may combine the DCI.

In order for UE 115-c to receive the DCI 410 from base station 105-c andbase station 105-d, the DCI 410 may be transmitted in correspondingPDCCH candidates (e.g., PDCCH decoding candidates). That is, there maybe a one-to-one mapping between a PDCCH candidate that includes the DCI410 from base station 105-c and a PDCCH candidate that includes the DCI410 from base station 105-d. For example, if base station 105-c is ableto transmit DCI 410 in two PDCCH candidates with an aggregation level offour (e.g., {4, 1} and {4, 2}) and one decoding candidate with anaggregation level of eight (e.g., {8, 1}), and base station 105-d isable to transmit DCI 410 in two PDCCH candidates with an aggregationlevel of four (e.g., {4, 1} and {4, 2}) and two PDCCH candidates with anaggregation level of eight (e.g., {8, 1} and {8, 2}), the DCI 410 may beincluded in the two PDCCH candidates with an aggregation level of four(e.g., ({4, 1}, {4, 1}) and ({4, 2}, {4,2})) and the first decodingcandidate with an aggregation level of eight (e.g., ({8, 1}, {8, 1})).Thus, the DCI 410 may be included in PDCCH candidates from base station105-c and base station 105-d having the same index (e.g., logical index)and the same aggregation level. In some cases, PDCCH candidates havingthe same index from different base stations may span different sets ofresources (e.g., different resource elements).

Since the PDCCH from base station 105-c and base station 105-d may beused to transmit DCI 410 to UE 115-c, UE 115-c may rate-match around thePDCCH that may include DCI 410 from base station 105-c and base station105-d (e.g., for receiving data from base station 105-c and/or basestation 105-d and for transmitting data to base station 105-c and/orbase station 105-d). In addition, if UE 115-c determines that the DCI410 may also be transmitted by a third base station 105, UE 115-c mayrate-match around the PDCCH that may include DCI 410 from the third basestation 105 (e.g., regardless of whether the third base station 105transmits the DCI 410). That is, UE 115-c may assume that DCI 410 istransmitted by all linked base stations 105 (or all linked TRPs), wherelinked base stations may correspond to base stations 105 configured totransmit the same DCI 410. In some cases, the PDCCH from base station105-c and base station 105-d may include demodulation reference signals(DRMSs) on a same DMRS port or on different DMRS ports. Theconfiguration of whether the PDCCH from different base stations 105include DMRSs on the same DMRS port or on different DMRS ports may beconfigurable (e.g., via a MAC-CE, DCI message, or RRC message).

In the examples described above, a base station 105 may use a MAC-CE,DCI message, or RRC message to provide various configurations for CSIreporting, SRS transmissions, and PDCCH transmissions. In some cases,instead of these configurations being signaled using the MAC-CE, DCImessage, or RRC message, these configurations may be stored at a UE 115and may be activated or deactivated using the MAC-CE, DCI message, orRRC message. Alternatively, in other cases, these configurations may beactivated or deactivated when a UE 115 enters or leaves a URLLC servicemode, and the specific configurations may be identified based on theBLER target for a URLLC service. In such cases, the UE 115 may identifywhether it has entered or left a URLLC mode based on a DCI formatassociated with the URLLC mode or based on an explicit bit in DCI thatindicates whether the UE 115 is in the URLLC mode (e.g., a bit thatindicates which mode the UE 115 is currently in).

FIG. 5 shows a block diagram 500 of a device 505 that supports URLLCwith multiple TRPs in accordance with aspects of the present disclosure.The device 505 may be an example of aspects of a UE 115 as describedherein. The device 505 may include a receiver 510, a communicationsmanager 515, and a transmitter 520. The device 505 may also include aprocessor. Each of these components may be in communication with oneanother (e.g., via one or more buses).

The receiver 510 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to URLLC withmultiple TRPs, etc.). Information may be passed on to other componentsof the device 505. The receiver 510 may be an example of aspects of thetransceiver 820 described with reference to FIG. 8. The receiver 510 mayutilize a single antenna or a set of antennas.

The communications manager 515 may receive a plurality of CSI-RSs oncorresponding CSI-RS resources associated with a CSI report, theplurality of CSI-RSs being associated with one or more sets of quasico-located antenna ports, identify, from a set of BLER targets, at leastone BLER target, generate the CSI report based on the at least one BLERtarget and the plurality of CSI-RSs, and transmit the generated CSIreport. The communications manager 515 may also identify, from a set ofBLER targets, a BLER target for a transmission of a SRS, determine aconfiguration for transmitting the SRS based on the BLER target, andtransmit the SRS according to the determined configuration. Thecommunications manager 515 may also monitor a set of PDCCH candidatesfor DCI from a set of base stations, receive the DCI in the PDCCHcandidates from the set of base stations, where each PDCCH candidatethat includes the DCI from one base station maps to a PDCCH candidatethat includes the DCI from another base station, combine the DCIreceived from the set of base stations in the set of PDCCH candidates,and receive data from or transmit data to at least one of the set ofbase stations based on the combined DCI. The communications manager 515may be an example of aspects of the communications manager 810 describedherein.

The communications manager 515, or its sub-components, may beimplemented in hardware, code (e.g., software or firmware) executed by aprocessor, or any combination thereof. If implemented in code executedby a processor, the functions of the communications manager 515, or itssub-components may be executed by a general-purpose processor, a DSP, anapplication-specific integrated circuit (ASIC), a field-programmablegate array (FPGA) or other programmable logic device, discrete gate ortransistor logic, discrete hardware components, or any combinationthereof designed to perform the functions described in the presentdisclosure.

The communications manager 515, or its sub-components, may be physicallylocated at various positions, including being distributed such thatportions of functions are implemented at different physical locations byone or more physical components. In some examples, the communicationsmanager 515, or its sub-components, may be a separate and distinctcomponent in accordance with various aspects of the present disclosure.In some examples, the communications manager 515, or its sub-components,may be combined with one or more other hardware components, includingbut not limited to an input/output (I/O) component, a transceiver, anetwork server, another computing device, one or more other componentsdescribed in the present disclosure, or a combination thereof inaccordance with various aspects of the present disclosure.

The transmitter 520 may transmit signals generated by other componentsof the device 505. In some examples, the transmitter 520 may becollocated with a receiver 510 in a transceiver module. For example, thetransmitter 520 may be an example of aspects of the transceiver 820described with reference to FIG. 8. The transmitter 520 may utilize asingle antenna or a set of antennas.

FIG. 6 shows a block diagram 600 of a device 605 that supports URLLCwith multiple TRPs in accordance with aspects of the present disclosure.The device 605 may be an example of aspects of a device 505 or a UE 115as described herein. The device 605 may include a receiver 610, acommunications manager 615, and a transmitter 655. The device 605 mayalso include a processor. Each of these components may be incommunication with one another (e.g., via one or more buses).

The receiver 610 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to URLLC withmultiple TRPs, etc.). Information may be passed on to other componentsof the device 605. The receiver 610 may be an example of aspects of thetransceiver 820 described with reference to FIG. 8. The receiver 610 mayutilize a single antenna or a set of antennas.

The communications manager 615 may be an example of aspects of thecommunications manager 515 as described herein. The communicationsmanager 615 may include a CSI-RS manager 620, a BLER target identifier625, a CSI report manager 630, an SRS configuration manager 635, a PDCCHcandidate manager 640, and a DCI manager 645. The communications manager615 may be an example of aspects of the communications manager 810described herein.

The CSI-RS manager 620 may receive a plurality of CSI-RSs oncorresponding CSI-RS resources associated with a CSI report, theplurality of CSI-RSs being associated with one or more sets of quasico-located antenna ports. The BLER target identifier 625 may identify,from a set of BLER targets, at least one BLER target. The CSI reportmanager 630 may generate the CSI report based on the at least one BLERtarget and the plurality of CSI-RSs. The transmitter 655 may transmitthe generated CSI report.

The BLER target identifier 625 may identify, from a set of BLER targets,a BLER target for a transmission of an SRS. The SRS configurationmanager 635 may determine a configuration for transmitting the SRS basedon the BLER target. The transmitter 655 may transmit the SRS accordingto the determined configuration.

The PDCCH candidate manager 640 may monitor a set of PDCCH candidatesfor DCI from a set of base stations. The DCI manager 645 may receive theDCI in the PDCCH candidates from the set of base stations, where eachPDCCH candidate that includes the DCI from one base station maps to aPDCCH candidate that includes the DCI from another base station. The DCImanager 645 may then combine the DCI received from the set of basestations in the set of PDCCH candidates. The transmitter 655 may receivedata from or transmitting data to at least one of the set of basestations based on the combined DCI.

The transmitter 655 may transmit signals generated by other componentsof the device 605. In some examples, the transmitter 655 may becollocated with a receiver 610 in a transceiver module. For example, thetransmitter 655 may be an example of aspects of the transceiver 820described with reference to FIG. 8. The transmitter 655 may utilize asingle antenna or a set of antennas.

FIG. 7 shows a block diagram 700 of a communications manager 705 thatsupports URLLC with multiple TRPs in accordance with aspects of thepresent disclosure. The communications manager 705 may be an example ofaspects of a communications manager 515, a communications manager 615,or a communications manager 810 described herein.. The communicationsmanager 705 may include a CSI-RS manager 710, a BLER target identifier715, a CSI report manager 720, a QCL manager 725, a CQI manager 730, aSRS configuration manager 735, a PDCCH candidate manager 740, and a DCImanager 745. Each of these modules may communicate, directly orindirectly, with one another (e.g., via one or more buses).

The CSI-RS manager 710 may receive a plurality of CSI-RSs oncorresponding CSI-RS resources associated with a CSI report, theplurality of CSI-RSs being associated with one or more sets of quasico-located antenna ports. The BLER target identifier 715 may identify,from a set of BLER targets, at least one BLER target. The CSI reportmanager 720 may generate the CSI report based on the at least one BLERtarget and the plurality of CSI-RSs. A transmitter in communicationswith communications manager 705 may transmit the generated CSI report.

In some examples, the QCL manager 725 may determine that a single set ofquasi co-located antenna ports was used to transmit the plurality ofCSI-RSs on the corresponding CSI-RS resources, and the BLER targetidentifier 715 may identify that a same BLER target of the plurality ofBLER targets is associated with the plurality of CSI-RSs received on thecorresponding CSI-RS resources. In such examples, the CSI report manager720 may generate the CSI report based on the same BLER target and theplurality of CSI-RSs.

In some examples, the QCL manager 725 may determine that a first set ofquasi co-located antenna ports was used to transmit a first set of theplurality of CSI-RSs and a second set of quasi co-located antenna portswas used to transmit a second set of the plurality of CSI-RSs, and theBLER target identifier 715 may identify that a single BLER target of theplurality of BLER targets is associated with the plurality of CSI-RSsreceived on the corresponding CSI-RS resources. In such examples, theCSI report manager 720 may generate the CSI report based on the singleBLER target and the first and second sets of the plurality of CSI-RSs.

In some cases, the CQI manager 730 may include a CQI in the CSI reportfor each of the first and second sets of the plurality of CSI-RSs basedon the single BLER target. In other cases, the CQI manager 730 mayinclude a CQI in the CSI report for either the first set of theplurality of CSI-RSs or the second set of the plurality of CSI-RSs basedon the single BLER target. In yet other cases, the CQI manager 730 mayinclude a CQI in the CSI report for each of the first and second sets ofthe plurality of CSI-RSs transmitted on a single CSI-RS resource of thecorresponding CSI-RS resources based on the single BLER target.

In some examples, the QCL manager 725 may determine that a first set ofquasi co-located antenna ports was used to transmit a first set of theplurality of CSI-RSs and a second set of quasi co-located antenna portswas used to transmit a second set of the plurality of CSI-RSs, and theBLER target identifier 715 may identify that multiple BLER targets ofthe set of BLER targets are associated with the plurality of CSI-RSs,each BLER target of the multiple BLER targets corresponding to a set ofquasi co-located antenna ports used to transmit a set of the pluralityof CSI-RSs. In such examples, the CSI report manager 720 may generatethe CSI report based on the multiple BLER targets and the first andsecond sets of the plurality of CSI-RSs. In some cases, the CQI manager730 may include a first CQI in the CSI report for the first set of theplurality of CSI-RSs based on a first BLER target of the multiple BLERtargets, and the CQI manager 730 may include a second CQI in the CSIreport for the second set of the plurality of CSI-RSs based on a secondBLER target of the multiple BLER targets.

In some examples, the CSI report manager 720 may receive a CSI reportconfiguration indicating the at least one BLER target. In some examples,the CQI manager 730 may receive a control message indicating a CQI tableassociated with each of the set of BLER targets. In some cases, thecontrol message includes a MAC-CE, RRC message, or a DCI message. Insome cases, the communications manager 705 is configured to transmit CSIreports, including the generated CSI report, associated with a same BLERtarget. In other cases, the communications manager 705 is configured totransmit CSI reports, including the generated CSI report, associatedwith different BLER targets.

The BLER target identifier 715 may identify, from a set of BLER targets,a BLER target for a transmission of an SRS. The SRS configurationmanager 735 may determine a configuration for transmitting the SRS basedon the BLER target. A transmitter in communications with communicationsmanager 705 may transmit the SRS according to the determinedconfiguration.

In some examples, the SRS configuration manager 735 may determine abandwidth for the SRS transmission based on the BLER target. In someexamples, the SRS configuration manager 735 may determine a number ofrepetitions in a time or frequency domain for the SRS transmission basedon the BLER target. In some examples, the SRS configuration manager 735may determine a power for the SRS transmission based on the BLER target.In some examples, the SRS configuration manager 735 may determine anumber of symbols for the SRS transmission based on the BLER target. Insome examples, the SRS configuration manager 735 may determine a comblevel for the SRS transmission based on the BLER target. In some cases,the comb level is further based on a bandwidth to be used for the SRStransmission.

In some examples, the BLER target identifier 715 may receive a CSIreport configuration associated with at least one CSI-RS resource, theCSI report configuration indicating a BLER target for a CSI report, andthe BLER target identifier 715 may identify the BLER target for thetransmission of the SRS as the BLER target for the CSI report based onan SRS resource for the transmission of the SRS being associated withthe at least one CSI-RS resource. In some examples, the SRSconfiguration manager 735 may receive a control message indicatingparameters for the SRS transmission. In some cases, the control messageincludes a MAC-CE, RRC message, or a DCI message.

The PDCCH candidate manager 740 may monitor a set of PDCCH candidatesfor DCI from a set of base stations. The DCI manager 745 may receive theDCI in the PDCCH candidates from the set of base stations, where eachPDCCH candidate that includes the DCI from one base station maps to aPDCCH candidate that includes the DCI from another base station. The DCImanager 745 may then combine the DCI received from the set of basestations in the set of PDCCH candidates. A transmitter in communicationswith communications manager 705 may transmit data to at least one of theset of base stations based on the combined DCI, or a receiver incommunications with communications manager 705 may receive data from atleast one of the set of base stations based on the combined DCI.

In some cases, the data is rate-matched around the PDCCH candidatesincluding DCI from the set of base stations and the PDCCH candidateswithout DCI from the set of base stations. In some cases, an index ofeach PDCCH candidate that includes the DCI is the same. In some cases,an aggregation level of each PDCCH candidate that includes the DCI isthe same. In some cases, a first PDCCH candidate including the DCI froma first base station spans a same set of resource elements as a secondPDCCH candidate including the DCI from a second base station. In somecases, a first PDCCH candidate including the DCI from a first basestation spans a different set of resource elements from a second PDCCHcandidate including the DCI from a second base station. In some cases, afirst PDCCH including the DCI from a first base station includes DMRSson a same port as DMRSs included in a second PDCCH including the DCIfrom a second base station. In some cases, a first PDCCH including theDCI from a first base station includes DMRSs on a different port fromDMRSs included in a second PDCCH including the DCI from a second basestation.

FIG. 8 shows a diagram of a system 800 including a device 805 thatsupports URLLC with multiple TRPs in accordance with aspects of thepresent disclosure. The device 805 may be an example of or include thecomponents of device 505, device 605, or a UE 115 as described herein.The device 805 may include components for bi-directional voice and datacommunications including components for transmitting and receivingcommunications, including a communications manager 810, an I/Ocontroller 815, a transceiver 820, an antenna 825, memory 830, and aprocessor 840. These components may be in electronic communication viaone or more buses (e.g., bus 845).

The communications manager 810 may receive a plurality of CSI-RSs oncorresponding CSI-RS resources associated with a CSI report, theplurality of CSI-RSs being associated with one or more sets of quasico-located antenna ports, identify, from a set of BLER targets, at leastone BLER target, generate the CSI report based on the at least one BLERtarget and the plurality of CSI-RSs, and transmit the generated CSIreport. The communications manager 810 may also identify, from a set ofBLER targets, a BLER target for a transmission of an SRS, determine aconfiguration for transmitting the SRS based on the BLER target, andtransmit the SRS according to the determined configuration. Thecommunications manager 810 may also monitor a set of PDCCH candidatesfor DCI from a set of base stations, receive the DCI in the PDCCHcandidates from the set of base stations, where each PDCCH candidatethat includes the DCI from one base station maps to a PDCCH candidatethat includes the DCI from another base station, combine the DCIreceived from the set of base stations in the set of PDCCH candidates,and receive data from or transmit data to at least one of the set ofbase stations based on the combined DCI.

The I/O controller 815 may manage input and output signals for thedevice 805. The I/O controller 815 may also manage peripherals notintegrated into the device 805. In some cases, the I/O controller 815may represent a physical connection or port to an external peripheral.In some cases, the I/O controller 815 may utilize an operating systemsuch as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS/2®, UNIX®, LINUX®, oranother known operating system. In other cases, the I/O controller 815may represent or interact with a modem, a keyboard, a mouse, atouchscreen, or a similar device. In some cases, the I/O controller 815may be implemented as part of a processor. In some cases, a user mayinteract with the device 805 via the I/O controller 815 or via hardwarecomponents controlled by the I/O controller 815.

The transceiver 820 may communicate bi-directionally, via one or moreantennas, wired, or wireless links as described above. For example, thetransceiver 820 may represent a wireless transceiver and may communicatebi-directionally with another wireless transceiver. The transceiver 820may also include a modem to modulate the packets and provide themodulated packets to the antennas for transmission, and to demodulatepackets received from the antennas.

In some cases, the wireless device may include a single antenna 825.However, in some cases the device may have more than one antenna 825,which may be capable of concurrently transmitting or receiving multiplewireless transmissions.

The memory 830 may include random-access memory (RAM) and read-onlymemory (ROM). The memory 830 may store computer-readable,computer-executable code 835 including instructions that, when executed,cause the processor to perform various functions described herein. Insome cases, the memory 830 may contain, among other things, a basicinput/output system (BIOS) which may control basic hardware or softwareoperation such as the interaction with peripheral components or devices.

The processor 840 may include an intelligent hardware device, (e.g., ageneral-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, anFPGA, a programmable logic device, a discrete gate or transistor logiccomponent, a discrete hardware component, or any combination thereof).In some cases, the processor 840 may be configured to operate a memoryarray using a memory controller. In other cases, a memory controller maybe integrated into the processor 840. The processor 840 may beconfigured to execute computer-readable instructions stored in a memory(e.g., the memory 830) to cause the device 805 to perform variousfunctions (e.g., functions or tasks supporting URLLC with multipleTRPs).

The code 835 may include instructions to implement aspects of thepresent disclosure, including instructions to support wirelesscommunications. The code 835 may be stored in a non-transitorycomputer-readable medium such as system memory or other type of memory.In some cases, the code 835 may not be directly executable by theprocessor 840 but may cause a computer (e.g., when compiled andexecuted) to perform functions described herein.

FIG. 9 shows a block diagram 900 of a device 905 that supports URLLCwith multiple TRPs in accordance with aspects of the present disclosure.The device 905 may be an example of aspects of a base station 105 asdescribed herein. The device 905 may include a receiver 910, acommunications manager 915, and a transmitter 920. The device 905 mayalso include a processor. Each of these components may be incommunication with one another (e.g., via one or more buses).

The receiver 910 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to URLLC withmultiple TRPs, etc.). Information may be passed on to other componentsof the device 905. The receiver 910 may be an example of aspects of thetransceiver 1220 described with reference to FIG. 12. The receiver 910may utilize a single antenna or a set of antennas.

The communications manager 915 may identify a plurality of CSI-RSs totransmit on corresponding CSI-RS resources, transmit a control messageindicating at least one BLER target, of a set of BLER targets, transmitthe plurality of CSI-RSs on the corresponding CSI-RS resources on one ormore sets of quasi co-located antenna ports, and receive a CSI reportbased on the at least one BLER target and the plurality of CSI-RSs. Thecommunications manager 915 may also identify, from a set of BLERtargets, a BLER target for a transmission of a SRS from a UE, transmit,to the UE, a control message indicating the BLER target for thetransmission of the SRS from the UE, and receive the SRS in accordancewith a configuration based on the BLER target. The communicationsmanager 915 may be an example of aspects of the communications manager1210 described herein.

The communications manager 915, or its sub-components, may beimplemented in hardware, code (e.g., software or firmware) executed by aprocessor, or any combination thereof. If implemented in code executedby a processor, the functions of the communications manager 915, or itssub-components may be executed by a general-purpose processor, a DSP, anapplication-specific integrated circuit (ASIC), an FPGA or otherprogrammable logic device, discrete gate or transistor logic, discretehardware components, or any combination thereof designed to perform thefunctions described in the present disclosure.

The communications manager 915, or its sub-components, may be physicallylocated at various positions, including being distributed such thatportions of functions are implemented at different physical locations byone or more physical components. In some examples, the communicationsmanager 915, or its sub-components, may be a separate and distinctcomponent in accordance with various aspects of the present disclosure.In some examples, the communications manager 915, or its sub-components,may be combined with one or more other hardware components, includingbut not limited to an input/output (I/O) component, a transceiver, anetwork server, another computing device, one or more other componentsdescribed in the present disclosure, or a combination thereof inaccordance with various aspects of the present disclosure.

The transmitter 920 may transmit signals generated by other componentsof the device 905. In some examples, the transmitter 920 may becollocated with a receiver 910 in a transceiver module. For example, thetransmitter 920 may be an example of aspects of the transceiver 1220described with reference to FIG. 12. The transmitter 920 may utilize asingle antenna or a set of antennas.

FIG. 10 shows a block diagram 1000 of a device 1005 that supports URLLCwith multiple TRPs in accordance with aspects of the present disclosure.The device 1005 may be an example of aspects of a device 905 or a basestation 105 as described herein. The device 1005 may include a receiver1010, a communications manager 1015, and a transmitter 1045. The device1005 may also include a processor. Each of these components may be incommunication with one another (e.g., via one or more buses).

The receiver 1010 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to URLLC withmultiple TRPs, etc.). Information may be passed on to other componentsof the device 1005. The receiver 1010 may be an example of aspects ofthe transceiver 1220 described with reference to FIG. 12. The receiver1010 may utilize a single antenna or a set of antennas.

The communications manager 1015 may be an example of aspects of thecommunications manager 915 as described herein. The communicationsmanager 1015 may include a CSI-RS manager 1020, a BLER target manager1025, a CSI report manager 1030, a BLER target identifier 1035, and aSRS manager 1040. The communications manager 1015 may be an example ofaspects of the communications manager 1210 described herein.

The CSI-RS manager 1020 may identify a plurality of CSI-RSs to transmiton corresponding CSI-RS resources. The BLER target manager 1025 maytransmit a control message indicating at least one BLER target, of a setof BLER targets. The CSI-RS manager 1020 may transmit the plurality ofCSI-RSs on the corresponding CSI-RS resources on one or more sets ofquasi co-located antenna ports. The CSI report manager 1030 may receivea CSI report based on the at least one BLER target and the plurality ofCSI-RSs.

The BLER target identifier 1035 may identify, from a set of BLERtargets, a BLER target for a transmission of an SRS from a UE. The BLERtarget manager 1025 may transmit, to the UE, a control messageindicating the BLER target for the transmission of the SRS from the UE.The SRS manager 1040 may receive the SRS in accordance with aconfiguration based on the BLER target.

The transmitter 1045 may transmit signals generated by other componentsof the device 1005. In some examples, the transmitter 1045 may becollocated with a receiver 1010 in a transceiver module. For example,the transmitter 1045 may be an example of aspects of the transceiver1220 described with reference to FIG. 12. The transmitter 1045 mayutilize a single antenna or a set of antennas.

FIG. 11 shows a block diagram 1100 of a communications manager 1105 thatsupports URLLC with multiple TRPs in accordance with aspects of thepresent disclosure. The communications manager 1105 may be an example ofaspects of a communications manager 915, a communications manager 1015,or a communications manager 1210 described herein. The communicationsmanager 1105 may include a CSI-RS manager 1110, a BLER target manager1115, a CSI report manager 1120, a CQI manager 1125, a MCS selector1130, a BLER target identifier 1135, and an SRS manager 1140. Each ofthese modules may communicate, directly or indirectly, with one another(e.g., via one or more buses).

The CSI-RS manager 1110 may identify a plurality of CSI-RSs to transmiton corresponding CSI-RS resources. The BLER target manager 1115 maytransmit a control message indicating at least one BLER target, of a setof BLER targets. The CSI-RS manager 1110 may transmit the plurality ofCSI-RSs on the corresponding CSI-RS resources on one or more sets ofquasi co-located antenna ports. The CSI report manager 1120 may receivea CSI report based on the at least one BLER target and the plurality ofCSI-RSs.

The CQI manager 1125 may identify a CQI included in the CSI reportassociated with a BLER target of the at least one BLER target. The MCSselector 1130 may select an MCS for transmitting data associated withthe BLER target based on the CQI. A transmitter in communication withcommunications manager 1105 may then transmit the data using theselected MCS. In some examples, the MCS selector 1130 may select the MCSfor transmitting the data associated with the BLER target from an MCStable associated with the BLER target. In some cases, the MCS tableassociated with the BLER target is used to select MCSs for datatransmissions using any set of antenna ports. In some cases, the MCStable associated with the BLER target includes a first MCS table used toselect MCSs for data transmissions using a first set of quasi co-locatedantenna ports, the first MCS table being different from a second MCStable used to select MCSs for data transmissions using a second set ofquasi co-located antenna ports.

In some cases, the indication of the at least one BLER target isincluded in a CSI report configuration. In some examples, the CQImanager 1125 may transmit another control message indicating a CQI tableassociated with each of the set of BLER targets. In some cases, theother control message includes a MAC-CE, RRC message, or a DCI message.

The BLER target identifier 1135 may identify, from a set of block errorrate (BLER) targets, a BLER target for a transmission of a SRS from aUE. The BLER target manager 1115 may transmit, to the UE, a controlmessage indicating the BLER target for the transmission of the SRS fromthe UE. The SRS manager 1140 may receive the SRS in accordance with aconfiguration based on the BLER target.

In some cases, the configuration includes a bandwidth used for the SRStransmission. In some cases, the configuration includes a number ofrepetitions in a time or frequency domain used for the SRS transmission.In some cases, the configuration includes a power used for the SRStransmission. In some cases, the configuration includes a number ofsymbols used for the SRS transmission. In some cases, the configurationincludes a comb level used for the SRS transmission. In some cases, thecomb level is based on a bandwidth used for the SRS transmission.

In some cases, the indication of the BLER target is included in a CSIreport configuration. In some examples, the SRS manager 1140 maytransmit another control message indicating SRS parameters for the SRStransmission. In some cases, the other control message includes aMAC-CE, RRC message, or a DCI message.

FIG. 12 shows a diagram of a system 1200 including a device 1205 thatsupports URLLC with multiple TRPs in accordance with aspects of thepresent disclosure. The device 1205 may be an example of or include thecomponents of device 905, device 1005, or a base station 105 asdescribed herein. The device 1205 may include components forbi-directional voice and data communications including components fortransmitting and receiving communications, including a communicationsmanager 1210, a network communications manager 1215, a transceiver 1220,an antenna 1225, memory 1230, a processor 1240, and an inter-stationcommunications manager 1245. These components may be in electroniccommunication via one or more buses (e.g., bus 1250).

The communications manager 1210 may identify a plurality of CSI-RSs totransmit on corresponding CSI-RS resources, transmit a control messageindicating at least one BLER target, of a set of BLER targets, transmitthe plurality of CSI-RSs on the corresponding CSI-RS resources on one ormore sets of quasi co-located antenna ports, and receive a CSI reportbased on the at least one BLER target and the plurality of CSI-RSs. Thecommunications manager 1210 may also identify, from a set of BLERtargets, a BLER target for a transmission of a SRS from a UE, transmit,to the UE, a control message indicating the BLER target for thetransmission of the SRS from the UE, and receive the SRS in accordancewith a configuration based on the BLER target.

The network communications manager 1215 may manage communications withthe core network (e.g., via one or more wired backhaul links). Forexample, the network communications manager 1215 may manage the transferof data communications for client devices, such as one or more UEs 115.

The transceiver 1220 may communicate bi-directionally, via one or moreantennas, wired, or wireless links as described above. For example, thetransceiver 1220 may represent a wireless transceiver and maycommunicate bi-directionally with another wireless transceiver. Thetransceiver 1220 may also include a modem to modulate the packets andprovide the modulated packets to the antennas for transmission, and todemodulate packets received from the antennas.

In some cases, the wireless device may include a single antenna 1225.However, in some cases the device may have more than one antenna 1225,which may be capable of concurrently transmitting or receiving multiplewireless transmissions.

The memory 1230 may include RAM, ROM, or a combination thereof. Thememory 1230 may store computer-readable code 1235 including instructionsthat, when executed by a processor (e.g., the processor 1240) cause thedevice to perform various functions described herein. In some cases, thememory 1230 may contain, among other things, a BIOS which may controlbasic hardware or software operation such as the interaction withperipheral components or devices.

The processor 1240 may include an intelligent hardware device, (e.g., ageneral-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, anFPGA, a programmable logic device, a discrete gate or transistor logiccomponent, a discrete hardware component, or any combination thereof).In some cases, the processor 1240 may be configured to operate a memoryarray using a memory controller. In some cases, a memory controller maybe integrated into processor 1240. The processor 1240 may be configuredto execute computer-readable instructions stored in a memory (e.g., thememory 1230) to cause the device #{device} to perform various functions(e.g., functions or tasks supporting URLLC with multiple TRPs).

The inter-station communications manager 1245 may manage communicationswith other base station 105 and may include a controller or schedulerfor controlling communications with UEs 115 in cooperation with otherbase stations 105. For example, the inter-station communications manager1245 may coordinate scheduling for transmissions to UEs 115 for variousinterference mitigation techniques such as beamforming or jointtransmission. In some examples, the inter-station communications manager1245 may provide an X2 interface within an LTE/LTE-A wirelesscommunication network technology to provide communication between basestations 105.

The code 1235 may include instructions to implement aspects of thepresent disclosure, including instructions to support wirelesscommunications. The code 1235 may be stored in a non-transitorycomputer-readable medium such as system memory or other type of memory.In some cases, the code 1235 may not be directly executable by theprocessor 1240 but may cause a computer (e.g., when compiled andexecuted) to perform functions described herein.

FIG. 13 shows a flowchart illustrating a method 1300 that supports URLLCwith multiple TRPs in accordance with aspects of the present disclosure.The operations of method 1300 may be implemented by a UE 115 or itscomponents as described herein. For example, the operations of method1300 may be performed by a communications manager as described withreference to FIGS. 5 through 8. In some examples, a UE may execute a setof instructions to control the functional elements of the UE to performthe functions described below. Additionally, or alternatively, a UE mayperform aspects of the functions described below using special-purposehardware.

At 1305, the UE may receive a plurality of CSI-RSs on correspondingCSI-RS resources associated with a CSI report, the plurality of CSI-RSsbeing associated with one or more sets of quasi co-located antennaports. The operations of 1305 may be performed according to the methodsdescribed herein. In some examples, aspects of the operations of 1305may be performed by a CSI-RS manager as described with reference toFIGS. 5 through 8.

At 1310, the UE may identify, from a set of BLER targets, at least oneBLER target. The operations of 1310 may be performed according to themethods described herein. In some examples, aspects of the operations of1310 may be performed by a BLER target identifier as described withreference to FIGS. 5 through 8.

At 1315, the UE may generate the CSI report based on the at least oneBLER target and the plurality of CSI-RSs. The operations of 1315 may beperformed according to the methods described herein. In some examples,aspects of the operations of 1315 may be performed by a CSI reportmanager as described with reference to FIGS. 5 through 8.

At 1320, the UE may transmit the generated CSI report. The operations of1320 may be performed according to the methods described herein. In someexamples, aspects of the operations of 1320 may be performed by atransmitter as described with reference to FIGS. 5 through 8.

FIG. 14 shows a flowchart illustrating a method 1400 that supports URLLCwith multiple TRPs in accordance with aspects of the present disclosure.The operations of method 1400 may be implemented by a base station 105or its components as described herein. For example, the operations ofmethod 1400 may be performed by a communications manager as describedwith reference to FIGS. 9 through 12. In some examples, a base stationmay execute a set of instructions to control the functional elements ofthe base station to perform the functions described below. Additionally,or alternatively, a base station may perform aspects of the functionsdescribed below using special-purpose hardware.

At 1405, the base station may identify a plurality of CSI-RSs totransmit on corresponding CSI-RS resources. The operations of 1405 maybe performed according to the methods described herein. In someexamples, aspects of the operations of 1405 may be performed by a CSI-RSmanager as described with reference to FIGS. 9 through 12.

At 1410, the base station may transmit a control message indicating atleast one BLER target, of a set of BLER targets. The operations of 1410may be performed according to the methods described herein. In someexamples, aspects of the operations of 1410 may be performed by a BLERtarget manager as described with reference to FIGS. 9 through 12.

At 1415, the base station may transmit the plurality of CSI-RSs on thecorresponding CSI-RS resources on one or more sets of quasi co-locatedantenna ports. The operations of 1415 may be performed according to themethods described herein. In some examples, aspects of the operations of1415 may be performed by a CSI-RS manager as described with reference toFIGS. 9 through 12.

At 1420, the base station may receive a CSI report based on the at leastone BLER target and the plurality of CSI-RSs. The operations of 1420 maybe performed according to the methods described herein. In someexamples, aspects of the operations of 1420 may be performed by a CSIreport manager as described with reference to FIGS. 9 through 12.

FIG. 15 shows a flowchart illustrating a method 1500 that supports URLLCwith multiple TRPs in accordance with aspects of the present disclosure.The operations of method 1500 may be implemented by a UE 115 or itscomponents as described herein. For example, the operations of method1500 may be performed by a communications manager as described withreference to FIGS. 5 through 8. In some examples, a UE may execute a setof instructions to control the functional elements of the UE to performthe functions described below. Additionally, or alternatively, a UE mayperform aspects of the functions described below using special-purposehardware.

At 1505, the UE may identify, from a set of BLER targets, a BLER targetfor a transmission of a SRS. The operations of 1505 may be performedaccording to the methods described herein. In some examples, aspects ofthe operations of 1505 may be performed by a BLER target identifier asdescribed with reference to FIGS. 5 through 8.

At 1510, the UE may determine a configuration for transmitting the SRSbased on the BLER target. The operations of 1510 may be performedaccording to the methods described herein. In some examples, aspects ofthe operations of 1510 may be performed by a SRS configuration manageras described with reference to FIGS. 5 through 8.

At 1515, the UE may transmit the SRS according to the determinedconfiguration. The operations of 1515 may be performed according to themethods described herein. In some examples, aspects of the operations of1515 may be performed by a transmitter as described with reference toFIGS. 5 through 8.

FIG. 16 shows a flowchart illustrating a method 1600 that supports URLLCwith multiple TRPs in accordance with aspects of the present disclosure.The operations of method 1600 may be implemented by a base station 105or its components as described herein. For example, the operations ofmethod 1600 may be performed by a communications manager as describedwith reference to FIGS. 9 through 12. In some examples, a base stationmay execute a set of instructions to control the functional elements ofthe base station to perform the functions described below. Additionally,or alternatively, a base station may perform aspects of the functionsdescribed below using special-purpose hardware.

At 1605, the base station may identify, from a set of BLER targets, aBLER target for a transmission of a SRS from a UE. The operations of1605 may be performed according to the methods described herein. In someexamples, aspects of the operations of 1605 may be performed by a BLERtarget identifier as described with reference to FIGS. 9 through 12.

At 1610, the base station may transmit, to the UE, a control messageindicating the BLER target for the transmission of the SRS from the UE.The operations of 1610 may be performed according to the methodsdescribed herein. In some examples, aspects of the operations of 1610may be performed by a BLER target manager as described with reference toFIGS. 9 through 12.

At 1615, the base station may receive the SRS in accordance with aconfiguration based on the BLER target. The operations of 1615 may beperformed according to the methods described herein. In some examples,aspects of the operations of 1615 may be performed by a SRS manager asdescribed with reference to FIGS. 9 through 12.

FIG. 17 shows a flowchart illustrating a method 1700 that supports URLLCwith multiple TRPs in accordance with aspects of the present disclosure.The operations of method 1700 may be implemented by a UE 115 or itscomponents as described herein. For example, the operations of method1700 may be performed by a communications manager as described withreference to FIGS. 5 through 8. In some examples, a UE may execute a setof instructions to control the functional elements of the UE to performthe functions described below. Additionally, or alternatively, a UE mayperform aspects of the functions described below using special-purposehardware.

At 1705, the UE may monitor a set of PDCCH candidates for DCI from a setof base stations. The operations of 1705 may be performed according tothe methods described herein. In some examples, aspects of theoperations of 1705 may be performed by a PDCCH candidate manager asdescribed with reference to FIGS. 5 through 8.

At 1710, the UE may receive the DCI in the PDCCH candidates from the setof base stations, where each PDCCH candidate that includes the DCI fromone base station maps to a PDCCH candidate that includes the DCI fromanother base station. The operations of 1710 may be performed accordingto the methods described herein. In some examples, aspects of theoperations of 1710 may be performed by a DCI manager as described withreference to FIGS. 5 through 8.

At 1715, the UE may combine the DCI received from the set of basestations in the set of PDCCH candidates. The operations of 1715 may beperformed according to the methods described herein. In some examples,aspects of the operations of 1715 may be performed by a DCI manager asdescribed with reference to FIGS. 5 through 8.

At 1720, the UE may receive data from or transmitting data to at leastone of the set of base stations based on the combined DCI. Theoperations of 1720 may be performed according to the methods describedherein. In some examples, aspects of the operations of 1720 may beperformed by a transmitter as described with reference to FIGS. 5through 8.

It should be noted that the methods described above describe possibleimplementations, and that the operations and the steps may be rearrangedor otherwise modified and that other implementations are possible.Further, aspects from two or more of the methods may be combined.

Techniques described herein may be used for various wirelesscommunications systems such as code division multiple access (CDMA),time division multiple access (TDMA), frequency division multiple access(FDMA), orthogonal frequency division multiple access (OFDMA), singlecarrier frequency division multiple access (SC-FDMA), and other systems.A CDMA system may implement a radio technology such as CDMA2000,Universal Terrestrial Radio Access (UTRA), etc. CDMA2000 covers IS-2000,IS-95, and IS-856 standards. IS-2000 Releases may be commonly referredto as CDMA2000 1X, 1X, etc. IS-856 (TIA-856) is commonly referred to asCDMA2000 1xEV-DO, High Rate Packet Data (HRPD), etc. UTRA includesWideband CDMA (WCDMA) and other variants of CDMA. A TDMA system mayimplement a radio technology such as Global System for MobileCommunications (GSM).

An OFDMA system may implement a radio technology such as Ultra MobileBroadband (UMB), Evolved UTRA (E-UTRA), Institute of Electrical andElectronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE802.20, Flash-OFDM, etc. UTRA and E-UTRA are part of Universal MobileTelecommunications System (UMTS). LTE, LTE-A, and LTE-A Pro are releasesof UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, LTE-A Pro, NR,and GSM are described in documents from the organization named “3rdGeneration Partnership Project” (3GPP). CDMA2000 and UMB are describedin documents from an organization named “3rd Generation PartnershipProject 2” (3GPP2). The techniques described herein may be used for thesystems and radio technologies mentioned above as well as other systemsand radio technologies. While aspects of an LTE, LTE-A, LTE-A Pro, or NRsystem may be described for purposes of example, and LTE, LTE-A, LTE-APro, or NR terminology may be used in much of the description, thetechniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro,or NR applications.

A macro cell generally covers a relatively large geographic area (e.g.,several kilometers in radius) and may allow unrestricted access by UEs115 with service subscriptions with the network provider. A small cellmay be associated with a lower-powered base station 105, as comparedwith a macro cell, and a small cell may operate in the same or different(e.g., licensed, unlicensed, etc.) frequency bands as macro cells. Smallcells may include pico cells, femto cells, and micro cells according tovarious examples. A pico cell, for example, may cover a small geographicarea and may allow unrestricted access by UEs 115 with servicesubscriptions with the network provider. A femto cell may also cover asmall geographic area (e.g., a home) and may provide restricted accessby UEs 115 having an association with the femto cell (e.g., UEs 115 in aclosed subscriber group (CSG), UEs 115 for users in the home, and thelike). An eNB for a macro cell may be referred to as a macro eNB. An eNBfor a small cell may be referred to as a small cell eNB, a pico eNB, afemto eNB, or a home eNB. An eNB may support one or multiple (e.g., two,three, four, and the like) cells, and may also support communicationsusing one or multiple component carriers.

The wireless communications system 100 or systems described herein maysupport synchronous or asynchronous operation. For synchronousoperation, the base stations 105 may have similar frame timing, andtransmissions from different base stations 105 may be approximatelyaligned in time. For asynchronous operation, the base stations 105 mayhave different frame timing, and transmissions from different basestations 105 may not be aligned in time. The techniques described hereinmay be used for either synchronous or asynchronous operations.

Information and signals described herein may be represented using any ofa variety of different technologies and techniques. For example, data,instructions, commands, information, signals, bits, symbols, and chipsthat may be referenced throughout the above description may berepresented by voltages, currents, electromagnetic waves, magneticfields or particles, optical fields or particles, or any combinationthereof.

The various illustrative blocks and modules described in connection withthe disclosure herein may be implemented or performed with ageneral-purpose processor, a digital signal processor (DSP), anapplication-specific integrated circuit (ASIC), an FPGA or otherprogrammable logic device (PLD), discrete gate or transistor logic,discrete hardware components, or any combination thereof designed toperform the functions described herein. A general-purpose processor maybe a microprocessor, but in the alternative, the processor may be anyconventional processor, controller, microcontroller, or state machine. Aprocessor may also be implemented as a combination of computing devices(e.g., a combination of a DSP and a microprocessor, multiplemicroprocessors, one or more microprocessors in conjunction with a DSPcore, or any other such configuration).

The functions described herein may be implemented in hardware, softwareexecuted by a processor, firmware, or any combination thereof. Ifimplemented in software executed by a processor, the functions may bestored on or transmitted over as one or more instructions or code on acomputer-readable medium. Other examples and implementations are withinthe scope of the disclosure and appended claims. For example, due to thenature of software, functions described above can be implemented usingsoftware executed by a processor, hardware, firmware, hardwiring, orcombinations of any of these. Features implementing functions may alsobe physically located at various positions, including being distributedsuch that portions of functions are implemented at different physicallocations.

Computer-readable media includes both non-transitory computer storagemedia and communication media including any medium that facilitatestransfer of a computer program from one place to another. Anon-transitory storage medium may be any available medium that can beaccessed by a general purpose or special purpose computer. By way ofexample, and not limitation, non-transitory computer-readable media mayinclude RAM, ROM, electrically erasable programmable read only memory(EEPROM), flash memory, compact disk (CD) ROM or other optical diskstorage, magnetic disk storage or other magnetic storage devices, or anyother non-transitory medium that can be used to carry or store desiredprogram code means in the form of instructions or data structures andthat can be accessed by a general-purpose or special-purpose computer,or a general-purpose or special-purpose processor. Also, any connectionis properly termed a computer-readable medium. For example, if thesoftware is transmitted from a website, server, or other remote sourceusing a coaxial cable, fiber optic cable, twisted pair, digitalsubscriber line (DSL), or wireless technologies such as infrared, radio,and microwave, then the coaxial cable, fiber optic cable, twisted pair,DSL, or wireless technologies such as infrared, radio, and microwave areincluded in the definition of medium. Disk and disc, as used herein,include CD, laser disc, optical disc, digital versatile disc (DVD),floppy disk and Blu-ray disc where disks usually reproduce datamagnetically, while discs reproduce data optically with lasers.Combinations of the above are also included within the scope ofcomputer-readable media.

As used herein, including in the claims, “or” as used in a list of items(e.g., a list of items prefaced by a phrase such as “at least one of” or“one or more of”) indicates an inclusive list such that, for example, alist of at least one of A, B, or C means A or B or C or AB or AC or BCor ABC (i.e., A and B and C). Also, as used herein, the phrase “basedon” shall not be construed as a reference to a closed set of conditions.For example, an exemplary step that is described as “based on conditionA” may be based on both a condition A and a condition B withoutdeparting from the scope of the present disclosure. In other words, asused herein, the phrase “based on” shall be construed in the same manneras the phrase “based at least in part on.”

In the appended figures, similar components or features may have thesame reference label. Further, various components of the same type maybe distinguished by following the reference label by a dash and a secondlabel that distinguishes among the similar components. If just the firstreference label is used in the specification, the description isapplicable to any one of the similar components having the same firstreference label irrespective of the second reference label, or othersubsequent reference label.

The description set forth herein, in connection with the appendeddrawings, describes example configurations and does not represent allthe examples that may be implemented or that are within the scope of theclaims. The term “exemplary” used herein means “serving as an example,instance, or illustration,” and not “preferred” or “advantageous overother examples.” The detailed description includes specific details forthe purpose of providing an understanding of the described techniques.These techniques, however, may be practiced without these specificdetails. In some instances, well-known structures and devices are shownin block diagram form in order to avoid obscuring the concepts of thedescribed examples.

The description herein is provided to enable a person skilled in the artto make or use the disclosure. Various modifications to the disclosurewill be readily apparent to those skilled in the art, and the genericprinciples defined herein may be applied to other variations withoutdeparting from the scope of the disclosure. Thus, the disclosure is notlimited to the examples and designs described herein, but is to beaccorded the broadest scope consistent with the principles and novelfeatures disclosed herein.

What is claimed is:
 1. A method for wireless communication at a userequipment (UE), comprising: receiving a plurality of channel stateinformation (CSI) reference signals (CSI-RSs) on corresponding CSI-RSresources associated with a CSI report, the plurality of CSI-RSs beingassociated with one or more sets of quasi co-located antenna ports;identifying, from a plurality of block error rate (BLER) targets, atleast one BLER target; generating the CSI report based at least in parton the at least one BLER target and the plurality of CSI-RSs; andtransmitting the generated CSI report.
 2. The method of claim 1, furthercomprising: determining that a single set of quasi co-located antennaports was used to transmit the plurality of CSI-RSs on the correspondingCSI-RS resources; identifying that a same BLER target of the pluralityof BLER targets is associated with the plurality of CSI-RSs received onthe corresponding CSI-RS resources; and generating the CSI report basedat least in part on the same BLER target and the plurality of CSI-RSs.3. The method of claim 1, further comprising: determining that a firstset of quasi co-located antenna ports was used to transmit a first setof the plurality of CSI-RSs and a second set of quasi co-located antennaports was used to transmit a second set of the plurality of CSI-RSs;identifying that a single BLER target of the plurality of BLER targetsis associated with the plurality of CSI-RSs received on thecorresponding CSI-RS resources; and generating the CSI report based atleast in part on the single BLER target and the first and second sets ofthe plurality of CSI-RSs.
 4. The method of claim 3, wherein generatingthe CSI report comprises: including a channel quality indicator (CQI) inthe CSI report for each of the first and second sets of the plurality ofCSI-RSs based at least in part on the single BLER target.
 5. The methodof claim 3, wherein generating the CSI report comprises: including achannel quality indicator (CQI) in the CSI report for either the firstset of the plurality of CSI-RSs or the second set of the plurality ofCSI-RSs based at least in part on the single BLER target.
 6. The methodof claim 3, wherein generating the CSI report comprises: including achannel quality indicator (CQI) in the CSI report for each of the firstand second sets of the plurality of CSI-RSs transmitted on a singleCSI-RS resource of the corresponding CSI-RS resources based at least inpart on the single BLER target.
 7. The method of claim 1, furthercomprising: determining that a first set of quasi co-located antennaports was used to transmit a first set of the plurality of CSI-RSs and asecond set of quasi co-located antenna ports was used to transmit asecond set of the plurality of CSI-RSs; identifying that multiple BLERtargets of the plurality of BLER targets are associated with theplurality of CSI-RSs, each BLER target of the multiple BLER targetscorresponding to a set of quasi co-located antenna ports used totransmit a set of the plurality of CSI-RSs; and generating the CSIreport based at least in part on the multiple BLER targets and the firstand second sets of the plurality of CSI-RSs.
 8. The method of claim 7,wherein generating the CSI report comprises: including a first channelquality indicator (CQI) in the CSI report for the first set of theplurality of CSI-RSs based at least in part on a first BLER target ofthe multiple BLER targets; and including a second CQI in the CSI reportfor the second set of the plurality of CSI-RSs based at least in part ona second BLER target of the multiple BLER targets.
 9. The method ofclaim 1, wherein identifying the at least one BLER target comprises:receiving a CSI report configuration indicating the at least one BLERtarget.
 10. The method of claim 1, further comprising: receiving acontrol message indicating a channel quality indicator (CQI) tableassociated with each of the plurality of BLER targets.
 11. The method ofclaim 10, wherein the control message comprises a medium access control(MAC) control element (MAC-CE), radio resource control (RRC) message, ora downlink control information (DCI) message.
 12. The method of claim 1,wherein the UE is configured to transmit CSI reports, including thegenerated CSI report, associated with a same BLER target.
 13. The methodof claim 1, wherein the UE is configured to transmit CSI reports,including the generated CSI report, associated with different BLERtargets.
 14. A method for wireless communication at a base station,comprising: identifying a plurality of channel state information (CSI)reference signals (CSI-RSs) to transmit on corresponding CSI-RSresources; transmitting a control message indicating at least one BLERtarget, of a plurality of BLER targets; transmitting the plurality ofCSI-RSs on the corresponding CSI-RS resources on one or more sets ofquasi co-located antenna ports; and receiving a CSI report based atleast in part on the at least one BLER target and the plurality ofCSI-RSs.
 15. The method of claim 14, further comprising: identifying achannel quality indicator (CQI) included in the CSI report associatedwith a BLER target of the at least one BLER target; selecting amodulation and coding scheme (MCS) for transmitting data associated withthe BLER target based at least in part on the CQI; and transmitting thedata using the selected MCS.
 16. The method of claim 15, whereinselecting the MCS for transmitting the data associated with the BLERtarget comprises: selecting the MCS for transmitting the data associatedwith the BLER target from an MCS table associated with the BLER target.17. The method of claim 16, wherein the MCS table associated with theBLER target is used to select MCSs for data transmissions using any setof antenna ports.
 18. The method of claim 16, wherein the MCS tableassociated with the BLER target comprises a first MCS table used toselect MCSs for data transmissions using a first set of quasi co-locatedantenna ports, the first MCS table being different from a second MCStable used to select MCSs for data transmissions using a second set ofquasi co-located antenna ports.
 19. The method of claim 14, wherein theindication of the at least one BLER target is included in a channelstate information (CSI) report configuration.
 20. The method of claim14, further comprising: transmitting another control message indicatinga channel quality indicator (CQI) table associated with each of theplurality of BLER targets.
 21. The method of claim 20, wherein the othercontrol message comprises a medium access control (MAC) control element(MAC-CE), radio resource control (RRC) message, or a downlink controlinformation (DCI) message.
 22. A method for wireless communication at auser equipment (UE), comprising: monitoring a plurality of physicaldownlink control channel (PDCCH) candidates for downlink controlinformation (DCI) from a plurality of base stations; receiving the DCIin the PDCCH candidates from the plurality of base stations, whereineach PDCCH candidate that includes the DCI from one base station maps toa PDCCH candidate that includes the DCI from another base station;combining the DCI received from the plurality of base stations in theplurality of PDCCH candidates; and receiving data from or transmittingdata to at least one of the plurality of base stations based at least inpart on the combined DCI.
 23. The method of claim 22, wherein the datais rate-matched around the PDCCH candidates including DCI from theplurality of base stations and the PDCCH candidates without DCI from theplurality of base stations.
 24. The method of claim 22, wherein an indexof each PDCCH candidate that includes the DCI is the same.
 25. Themethod of claim 22, wherein an aggregation level of each PDCCH candidatethat includes the DCI is the same.
 26. The method of claim 22, wherein afirst PDCCH candidate including the DCI from a first base station spansa same set of resource elements as a second PDCCH candidate includingthe DCI from a second base station.
 27. The method of claim 22, whereina first PDCCH candidate including the DCI from a first base stationspans a different set of resource elements from a second PDCCH candidateincluding the DCI from a second base station.
 28. The method of claim22, wherein a first PDCCH including the DCI from a first base stationincludes demodulation reference signals (DMRSs) on a same port as DMRSsincluded in a second PDCCH including the DCI from a second base station.29. The method of claim 22, wherein a first PDCCH including the DCI froma first base station includes demodulation reference signals (DMRSs) ona different port from DMRSs included in a second PDCCH including the DCIfrom a second base station.
 30. An apparatus for wireless communicationat a user equipment (UE), comprising: a processor, memory coupled withthe processor; and instructions stored in the memory and executable bythe processor to cause the apparatus to: receive a plurality of channelstate information (CSI) reference signals (CSI-RSs) on correspondingCSI-RS resources associated with a CSI report, the CSI-RSs beingtransmitted on one or more sets of quasi co-located antenna ports;identify, from a plurality of block error rate (BLER) targets, at leastone BLER target; generate the CSI report based at least in part on theat least one BLER target and the received CSI-RSs; and transmit thegenerated CSI report.